GB2626154A

GB2626154A - Stackable hydroponic and/or aeroponic planter

Info

Publication number: GB2626154A
Application number: GB2300427.8A
Authority: GB
Inventors: Edward Kingsborough Cody Thomas; Cody Tamara
Original assignee: Totam Ltd
Current assignee: Totam Ltd
Priority date: 2023-01-11
Filing date: 2023-01-11
Publication date: 2024-07-17
Also published as: WO2024149993A1

Abstract

A stackable hydroponic and/or aeroponic planter 110 is provided for feeding and display of plants. The planter comprises a base unit 12 having a housing 14, a primary nutrient reservoir in the housing, a capping element 16 having a secondary nutrient reservoir(54, figure 4), and which defines a mounting plane. There is also a pump (42, figure 3) and a demountable plant module (20) having a growth-medium container (26), the demountable plant module being supportable by the capping element and a liquid delivery element (58). The capping element is configured to receive a further demountable plant module, whilst maintaining a complete recirculating nutrient flow-path through the planter. The planter may further comprise a second demountable plant module 120 having a second growth medium container (126, figure 12), the second growth module being supportable by the capping elements at or adjacent to the mounting plane. The second plant module may include a tertiary nutrient reservoir (182) which overlaps the second growth medium container. Also claimed is a method of converting a stackable hydroponic container into a hydroponic and aeroponic container.

Description

Stackable Hydroponic and/or Aeroponic Planter The present invention relates to a stackable hydroponic and/or aeroponic planter, and/or to a method of adapting a hydroponic planter to become a hybrid hydroponicand-aeroponic planter.

Hydroponic agriculture is a method of growing plants in the absence of soil and instead using nutrient solution. The roots of the plants are submerged in the nutrient solution. Hydroponics have numerous benefits such as high yield, significantly reduced water usage, as well as generally being naturally organic and pesticide free.

Aeroponics is a subset of hydroponics, where plant roots are suspended in air and periodically watered with nutrient solution, usually by spraying or misting. The benefit of this type of system over other hydroponics is the root structure always has access to water, nutrients and oxygen. However, the biggest issue with aeroponics is the eventuality of a loss of water delivery through an event such as a power cut or pump failure.

Hybrid hydroponic and aeroponic systems provide the benefit of hydroponics whereby a reservoir of nutrient liquid is provided, as well as having aeroponic features in place to periodically water the roots using atomised or sprayed nutrient liquid. Thus, in the event of a power cut or pump failure, the plant roots still receive nutrients from the reservoir of nutrient liquid.

Stackable systems with a mechanism to grow plants from lower modules may not be able to provide suitable light to the lower plants. They also may find it difficult to provide a suitable volume of nutrients to the plants below or each plant may have to be watered individually, providing the user with a more strenuous plant-care routine.

Furthermore, certain staggered planter bags have the ability to grow multiple plants at an angle to the wall. However, there is no watering mechanism provided to suitably water the plants.

It is an object of the present invention to reduce or substantially obviate the aforementioned problems.

According to a first aspect of the invention, there is provided a stackable hydroponic and/or aeroponic planter for feeding and display of plants, the planter comprising: a base unit having a housing, a primary nutrient reservoir in the housing, and a capping element having a secondary nutrient reservoir, a mounting plane being defined at or adjacent to the secondary nutrient reservoir; a pump; a demountable plant module having a growth-medium container, the demountable plant module being supportable by the capping element at or adjacent to the mounting plane; a liquid delivery element in liquid communication with the demountable plant module; a recirculating nutrient flow-path being defined by at least the primary nutrient reservoir, the secondary nutrient reservoir, the pump, the liquid delivery element and the growth-medium container; and an overflow port which is in the secondary nutrient reservoir, the overflow port being on the recirculating nutrient flow-path; the capping element being configured to receive a further demountable plant module which is different from the first said demountable plant module the liquid delivery elements of the first and further demountable plant modules each forming part of the recirculating nutrient flow-path.

The first and at least one second said demountable plant modules are preferably arrangeable in stacked formation on the base unit. The stacked formation allows for the stacked growth of plants. The demountable nature of the demountable plant modules is also advantageous as the height of the stackable hydroponic and/or aeroponic planter can be varied depending on the user's preference.

The recirculating nutrient flow-path provides the first demountable plant module and the second demountable plant modules with nutrient liquid continuously or periodically to keep the plants in good health.

Particularly, the overflow port is in fluid communication with the nutrient-inlet port and thus nutrient liquid is delivered from one demountable plant module to another via the overflow port. The nutrient-inlet port of the demountable plant module is advantageously in the side of the growth-medium container so that the nutrient-liquid is deliverable directly into the growth-medium container.

Optionally, the pump is located in the base unit. The pump is then able to fit easily into the base unit and also easily accessible for maintenance.

Preferably, there are a plurality of said demountable plant modules being supportable in a spaced-apart relationship at or adjacent to the said mounting plane. A plurality of demountable plant modules is advantageous as there is the possibility of growing a large number of varying plants. The demountable plant modules are also preferably spaced apart and thus the plants growing are not hindered and/or are limited from overlapping. Furthermore, the spaced apart relationship is advantageous because this relationship adapts the hydroponic planter to become a hydroponic-and-aeroponic planter once the plurality of demountable plant modules are stacked on top of one another.

Advantageously, the stackable hydroponic and/or aeroponic planter may further comprise a feeder manifold which is at or adjacent to the mounting plane, the feeder manifold forming a further part of the said recirculating nutrient flow-path. The feeder manifold distributes a suitable volume of nutrient liquid to the growth-medium containers and thus the plants are provided with nutrients to grow.

Preferably, the liquid delivery element may include a releasable connector on the recirculating nutrient flow-path to enable a second said growth-medium container to be stackably insertable between the base unit and the first said growth-medium container.

The nutrient liquid delivery is preferably not hindered by the stackable nature of the planter; the planter has a structure to ensure that the liquid is still transportable to the first said growth-medium container even when the second said growth-medium container is inserted.

Optionally, the mounting plane is spaced from the primary nutrient reservoir. This is advantageous because the demountable plant modules can be mounted on the mounting plane and thus be above the primary nutrient reservoir.

Preferably, the first said growth-medium container may extend into the capping element. The first growth-medium container is thus preferably able to extend close to the secondary nutrient reservoir.

Optionally, the first said growth-medium container has a growth-medium access aperture which is or is substantially parallel with the mounting plane. The first growth-medium container is thus able to receive a growth medium.

Advantageously, the nutrient-inlet port of the growth-medium container is preferably spaced from the growth-medium access aperture. Thus, the nutrient liquid is able to be delivered from the nutrient-inlet port to the growth-medium container.

Preferably, the said first demountable plant module includes a first module housing which releasably supports the associated first said growth-medium container. The growth-medium container could be part of or a separate component to the demountable plant module and can be removed or engaged with the first module housing.

Advantageously, the first demountable plant module preferably includes a retainer which secures the first growth-medium container to the first module housing. This is advantageous as the growth-medium container is secured in place and the movement of the growth-medium container is hindered and/or limited if the planter is moved.

Optionally, the stackable hydroponic and/or aeroponic planter may preferably further comprise a second demountable plant module having a second growth-medium container, the second demountable plant module being supportable by the capping element at or adjacent to the mounting plane. The second demountable plant module is thus able to support a second growth-medium container and thus more plants are able to grow on the planter.

Preferably, the second demountable plant module may include a tertiary nutrient reservoir which overlaps the second growth-medium container. Having a tertiary nutrient reservoir promotes ease of transfer of nutrients via gravity.

Advantageously, a further growth-medium access aperture of the second growth-medium container may preferably be at an angle to the mounting plane of the base unit. The advantage of having an angled growth-medium container is to promote plants to grow at an angle which may be more aesthetic for the user. Additionally, this arrangement may have improved growing capacity, as more plants can be grown in the floor space taken by the planter.

Preferably, a further overflow port may be in a base of the tertiary nutrient reservoir.

This provides a flow-path for the nutrient liquid in the tertiary reservoir to enter the nutrient-inlet of the second growth-medium container.

The said base of the tertiary nutrient reservoir is preferably at an angle to the mounting plane of the base unit. This is advantageous as the angle of the base promotes the accumulation of a larger volume of nutrient liquid before the nutrient liquid enters the second said overflow port.

Optionally, when the said second demountable plant module is mounted on the base unit, the second growth-medium container is preferably spaced from the secondary nutrient reservoir, so as to form a hybrid hydroponic-and-aeroponic planter. Thus, the plant held within the second growth-medium container receives both advantages of using hydroponic watering and aeroponic watering.

Preferably, the stackable hydroponic and/or aeroponic planter may further comprise a third demountable plant module having a third growth-medium container, the third demountable plant module being supportable by the capping element at or adjacent to the mounting plane. The third demountable plant module is thus able to support a third growth-medium container and thus more plants are able to grow on the planter.

Optionally, the third demountable plant module preferably includes a wicking element. Preferably, an additional said growth-medium access aperture of the third growth-medium container is at an angle to the mounting plane of the base unit, the additional growth-medium access aperture being configured to receive the wicking element. This is advantageous because the third plant module is preferably a different plant module to the first and second plant modules and therefore can support a different plant. The wicking element is able to grow seedlings therefrom, providing the third demountable plant module with the structural support to grow a variety of plants on the stackable hydroponic and/or aeroponic planter.

Optionally, the third demountable plant module preferably further comprises an aperture surface located at or adjacent to the additional growth-medium access aperture. The said aperture surface is preferably able to receive a large number of plant roots therethrough, the aperture surface therefore providing an anchoring point for said roots.

Optionally, the said angle is preferably acute. This provides the growth-medium container with a sensible angle for the plants to grow out from the growth-medium container. Furthermore, the acute angle promotes the second growth medium container to retain the nutrient liquid before the nutrient liquid exits the second growth medium container so that the growth medium is sufficiently moist. The moist growth medium promotes the plants to grow.

Advantageously, the stackable hydroponic and/or aeroponic planter preferably further comprises a light-emitting device. The, preferably length-adjustable, light-emitting device provides light to the plants growing from the first and second growth-medium containers to allow the plants to be viewed. Additionally, the light provides the plants with suitable light to photosynthesise.

Preferably, the light-emitting device may be pivotably mounted at or adjacent to the base unit. The light-emitting device is thus able to be moved relative to the planter for the plants to receive an optimal amount of light to grow.

A stackable hydroponic and/or aeroponic planter is preferably in the form of a kit of parts. This is advantageous because the stackable hydroponic planter is modular and easily assembleable.

In one preferable embodiment, the first demountable plant module may be a hydroponic planter module, and the further demountable plant module may be an aeroponic planter module, the hydroponic planter being adapted to become a hydroponic-and-aeroponic planter upon mounting of the further demountable plant module.

The modular arrangement of the present invention allows for rapid conversion between hydroponic and aeroponic modes of operation.

According to a second aspect of the invention, there is provided a method of converting a stackable hydroponic planter into a hydroponic-and-aeroponic planter, the method comprising the steps of: a] providing a stackable hydroponic planter in accordance with the first aspect of the invention; b] engaging a further demountable plant module which is different from the first said demountable plant module with the capping element, the further demountable plant module forming a tertiary nutrient reservoir, a further growth medium container of the further demountable plant module being positioned so as to be spaced apart from the secondary nutrient reservoir; and c] engaging the first demountable plant module with the further demountable plant module to complete the recirculating nutrient flow-path, the first said growth-medium container being spaced apart from the tertiary nutrient reservoir. The insertion of a second growth-medium container between the base unit and the first growth medium container is that the hydroponic planter is able to increase in height and more plants can be grown. Furthermore, the addition of the second growth-medium container converts the hydroponic planter to a hybrid hydroponic-and-aeroponic planter and thus both hydroponic and aeroponic features are accessible to the user and the plants.

Optionally, the further growth-medium container may have a different orientation to the first growth-medium container. A different orientation may allow for the optimised or more favourable growing conditions to be achieved.

Preferably, during step b], a plurality of further demountable plant modules may be stacked on top of one another prior to step c].

In one embodiment, during step b], the plurality of further demountable plant modules may comprise a plurality of the same type of demountable plant module.

In another embodiment, during step b], the plurality of further demountable plant modules may comprise a plurality of different types of demountable plant module.

The provision of stackable plant modules provides the end user with ready capacity to construct a planter of their own choosing, which can be either purely hydroponic, purely aeroponic, or a hybrid hydroponic and aeroponic planter.

Advantageously, in a hydroponic-planter condition, the first growth-medium container is preferably in contact with nutrient in its associated said nutrient reservoir, and in a hydroponic-and-aeroponic adapted planter condition the first growth-medium container is spaced from nutrient in its associated said nutrient reservoir. This conversion from the hydroponic-planter condition to the hydroponic-and-aeroponic adapted planter allows the plants to benefit from both the hydroponic watering features and the aeroponic watering features simply by inserting the second demountable plant module.

Preferably, the first said associated nutrient reservoir may be different to the second said associated nutrient reservoir. Different reservoirs provide a different purpose for the growing plants and provide the user with options of where to grow the plants.

According to a further aspect of the invention, there is provided a stackable hydroponic planter for feeding and display of plants, the planter comprising: a base unit having a primary nutrient reservoir and defining a mounting plane; a secondary nutrient reservoir which is located or locatable at or adjacent to the said mounting plane; a pump; a growth-medium container which is supportable at or adjacent to the mounting plane; a liquid delivery element which is in liquid communication with the primary nutrient reservoir, the secondary nutrient reservoir, the pump, and the growth-medium container at least in part forming a recirculating nutrient flow-path; characterised in that an overflow port is in the secondary nutrient reservoir, and a nutrient-inlet port is in a side of the growth-medium container, the overflow port and the nutrient-inlet port being on the recirculating nutrient flow-path.

Advantageously, the overflow port is in fluid communication with the nutrient-inlet port and thus nutrient liquid is delivered from one demountable plant module to another via the overflow port. The nutrient-inlet port of the demountable plant module is advantageously in the side of the growth-medium container so that the nutrient-liquid is deliverable directly into the growth-medium container.

According to a further aspect of the invention, there is provided a stackable hydroponic and/or aeroponic planter for feeding and display of plants, the planter comprising: a base unit having a housing, a primary nutrient reservoir in the housing; a secondary nutrient reservoir; a growth-medium container which is supportable by the housing; and a further growth-medium container interposed in stacked relationship between the housing and the first said growth-medium container, a continuous recirculating nutrient flow being formed between the primary nutrient reservoir, the secondary nutrient reservoir, the first growth-medium container, and the further growth-medium container.

The recirculating nutrient flow-path provides the first growth-medium container and the second growth-medium container with nutrient liquid continuously to keep the plants in good health.

According to a further aspect of the invention, there is provided a hybrid hydroponic-and-aeroponic planter for feeding and display of plants, the hybrid hydroponic-andaeroponic planter comprising: a base unit having a primary nutrient reservoir; a pump; a secondary nutrient reservoir which is spaced from the primary nutrient reservoir; a liquid delivery element through which nutrient liquid is deliverable from the primary nutrient reservoir to the secondary nutrient reservoir via the pump to form a recirculating nutrient flow-path; a plant module supportable by the base unit, the plant module having an angled growth-medium container; an overflow port in a wall of the secondary nutrient reservoir so that nutrient liquid is deliverable under gravity from the secondary nutrient reservoir to the angled growth-medium container.

Nutrient liquid is therefore deliverable from the primary nutrient reservoir to the secondary nutrient reservoir and then via the overflow port to the growth-medium container, adventurously forming the recirculating nutrient flow-path.

The nutrient-inlet port of the demountable plant module is advantageously in the side of the growth-medium container so that the nutrient-liquid is deliverable directly into the growth-medium container.

According to a further aspect of the invention, there is provided a modular hydroponic and/or aeroponic planter for feeding and display of plants, the modular hybrid hydroponic and/or aeroponic planter comprising: a base unit having a main nutrient reservoir; a pump; and a first plant module and a second plant module which are stackably supportable by the base unit, the first and second plant modules being associated with corresponding secondary and tertiary reservoirs so as to be liquidly communicable with the pump and the main nutrient reservoir thereby forming a recirculating nutrient flow-path, the first plant module having a first growth-medium container and the second plant module having a second growth-medium container which are spaced from the corresponding secondary and tertiary reservoirs, characterised in that a first access aperture of the first growth-medium container is at a first angle, and a second access aperture of the second growth-medium container is at a second angle which is different to the said first angle, the first growth-medium container capping the second plant module.

The first access aperture being at an angle allows the user to grow plants at an angle which promotes sufficient light exposure for the plants to grow.

As the second access aperture is at a different angle, a further orientation of plants can advantageously be grown.

For a better understanding of the present invention, and to show more clearly how it may be carried into effect, reference will now be made by way of example only to the accompanying drawings, in which: Figure 1 shows an isometric representation of a first embodiment of a stackable hydroponic and/or aeroponic planter in accordance with a first aspect of the invention; Figure 2 shows an isometric representation of a housing of the base unit of the apparatus of Figure 1; Figure 3 shows a vertical cross-sectional view through the stackable hydroponic and/or aeroponic planter of Figure 1, wherein a recirculating nutrient flow-path from a pump in a base unit to a growth-medium container is shown by the solid arrows; Figure 4 is a vertical cross-sectional view of Figure 1 for the apparatus of Figure 1 showing the nutrient liquid therein; Figure 5 shows an isometric cross-sectional representation through the base unit of Figure 3, showing the secondary nutrient reservoir in detail; Figure 6 is a perspective representation of a first demountable plant module of the stackable hydroponic apparatus of Figure 1; Figure 7 shows a cross-sectional representation of the first demountable plant module of Figure 6; Figure 8 shows an enlarged cross-sectional representation through the base unit of Figure 3; Figure 9 shows a second embodiment of the stackable hydroponic and/or aeroponic planter in accordance with the first aspect of the invention, including a plurality of further demountable plant modules engaged with the first embodiment of the stackable hydroponic and/or aeroponic planter; Figure 10 is a front view of the stackable hydroponic and/or aeroponic planter of Figure 9; Figure 11 shows an isometric representation of a second demountable plant module used in the stackable hydroponic and/or aeroponic planter of Figures 9 and 10; Figure 12 shows a cross-sectional representation of the second demountable plant module of Figure 11, including a second growth-medium container; Figure 13 shows a cross section along line A-A of the stackable hydroponic and/or aeroponic planter of Figure 9 with the nutrient liquid omitted; Figure 14 is a further cross section along line A-A of the stackable hydroponic and/or aeroponic planter of Figure 9 showing the nutrient liquid; Figure 15 is an exploded view of the stackable hydroponic and/or aeroponic planter of Figure 14; Figure 16 is a pictorial representation of a third embodiment of a stackable hydroponic and/or aeroponic planter in accordance with the first aspect of the invention; Figure 17 shows a perspective view of the third demountable plant module of Figure 16; Figure 18 is a cross sectional-view of the third demountable plant module of Figure 17; Figure 19 is an exploded view of the third demountable plant module of Figure 17 and Figure 20 is a cross-sectional representation of the stackable hydroponic and/or aeroponic planter of Figure 16.

Referring firstly to Figure 1, a stackable hydroponic and/or aeroponic planter is shown, referenced globally at 10. The stackable hydroponic and/or aeroponic planter 10 comprises a base unit 12, comprising a housing 14 and a capping element 16, as well as a light-emitting device 18 extending from the base unit 12.

The stackable hydroponic and/or aeroponic planter 10 comprises the base unit 12 and at least one first demountable plant module 20, receivably engaged with the base unit 12.

The base unit 12 comprises the housing 14, the capping element 16. The said base unit 12 supports at least one, and preferably a plurality of the first demountable plant modules 20 and the capping element 16. The base unit 12 also provides support for a light-emitting device 18. In the depicted embodiment, this is shown as an anchor portion 22 on the base unit 12, from which a, preferably length-adjustable, mount 24 for the light emitting device 18 extends. The mount 24 shown has a telescopic portion 25.

Each of the first demountable plant modules 20 has a first growth-medium container 26 inserted therein having a plant aperture 28 through a lid 29 thereof, described in more detail below.

The capping element 16 comprises a plurality of receivers 30 into which the said first demountable plant modules 20 are receivable. Here, four such first demountable plant modules 20 are provided, linearly aligned along a width of the base unit 12. It will be apparent, however, that the number of receivers 30 will be dictated by the size of the stackable hydroponic and/or aeroponic planter 10.

The capping element 16 shown has an upstand 32 to raise the plurality of receivers 30, thereby providing an additional internal volume to the base unit 12.

Figure 2 shows the housing 14 of the base unit 12 in isolation from the capping element 16. There is a receiver surface 34 on the top of the housing 14 via which the capping element 16 can engage, though it will be appreciated that the capping element 16 and housing 14 could be integrally formed with one another.

The receiver surface 34 includes a plurality of reservoir access apertures 36, here each being defined by an upstanding engagement bracket 38. A feeder manifold 40 is also provided across the receiver surface 34, via which nutrient fluid can be pumped into the first demountable plant modules 20. The feeder manifold 40 includes a plurality of engagement ports 41 which are upstanding therefrom, and which interconnect with other parts of the fluid circulation system as will be described in more detail below.

As shown in Figures 3 and 4, the housing 14 of the base unit 12 is preferably a hollow rigid member made of, for example, plastic, metal, or carbon fibre. A pump 42 for circulating the nutrient fluid within the stackable hydroponic and/or aeroponic planter 10 is provided within the housing 14. The base unit 12 may preferably comprise a power inlet 44 to provide electricity to the light-emitting device 18 on the base unit 12 and the pump 42, which is housed within the base unit 12. This may be provided through a gland 46 in the base unit 12, so that there is no risk of fluid ingress into exposed electrical components.

The housing 14 of the base unit 12 comprises a primary nutrient reservoir 48. The pump 42 is located inside the primary nutrient reservoir 48, shown in Figure 3, and therefore also includes a pump outlet 50, which may preferably be provided as a flexible pipe. It is possible that the pump outlet 50 may be a rigid pipe, however.

The housing 14 preferably comprises a slidable element 52 which is slidable relative to the capping element 16 for easy access to the primary nutrient reservoir 48, which is preferably where the pump 42 is located. The slidable element 52 is preferably provided as a drawer such that the user can open the housing 14 to refill or replenish the nutrient liquid and/or maintain the pump 42 and recirculating nutrient flow-path. The slidable element 52 preferably has an exposed outer wall made of plastic, metal, carbon fibre or wood for structural and/or aesthetic purposes.

The slidable element 52 optionally comprises a grip portion for the user to slide the slidable element 52 with respect to the base unit 12.

The light-emitting device 18 is preferably pivotably mounted at the anchor portion 22 at or adjacent to the base unit 12, and may also be pivotably engaged with the mount 24 in a similarly pivotable manner at a pivot 53. Pivotable movement allows for the light-emitting device 18 to be adjusted to best illuminate the plants, and could be automatically controlled, for example, by robotic control means. The light-emitting device 18 has a width preferably equal to or substantially equal to a cumulative width defined by the first demountable plant modules 20.

The said pump 42, shown in Figure 3, preferably urges nutrient liquid around the recirculating nutrient flow-path. The pump outlet 50 preferably connects the pump 42 to the feeder manifold 40.

The pump 42 is preferably connected to an electricity delivery means, which is preferably a wire, the electricity delivery means providing power to activate the pump 42.

Whilst a single pump 42 is shown, it is feasible that there may be more than one pump, depending on the amount of fluid flow required. It is thus feasible that there may be one pump per vertical modular stack.

There is first growth medium container 26 associated with each of the first demountable plant modules 20, best shown in Figure 3. The first growth-medium containers 26 are in contact with individual, or one collective, secondary nutrient reservoirs 54 so that the plants contained therein are watered hydroponically. In a preferred embodiment, the or each secondary nutrient reservoir 54 is defined by the capping element 16, though it will be appreciated that the secondary nutrient reservoir 54 could be provided as a discrete component.

The first growth-medium containers 26 are respectively receivably engagable with the first demountable plant modules 20 and can be removed therefrom.

Each first growth-medium container 26 is preferably a rigid container made of plastic, metal, or fibreglass for structural rigidity and so that a growth medium is supportable therein.

The first growth-medium container 26 is supportable by a retainer 56 of the first demountable plant module 20 and thus the first growth-medium container 26 is prevented and/or inhibited from becoming dislodged from the first demountable plant module 20.

In the depicted embodiment, the first demountable plant modules 20 engage with the first growth-medium containers 26, such that a growth opening 28 of the first growth-medium containers 26 are positioned in a plane parallel or substantially parallel with the ground. This can be considered to be a first mounting plane M1 of the stackable hydroponic apparatus 10 and is illustrated in Figure 4.

The first growth-medium containers 26 include a nutrient-inlet port 58 located in the side thereof. Additionally, each first growth-medium container 26 preferably comprises one or more drainage apertures 60. The or each drainage aperture 60 is aligned to in-use drain into the secondary nutrient reservoir 54. The drainage apertures 60 could be formed by forming the first growth-medium containers 26 from a mesh material.

The first growth-medium container 26 preferably comprises a growth-medium access aperture 62 which is or is substantially parallel to the first mounting plane Ml. The first growth-medium access aperture 62 is preferably the aperture through which growth medium is deposited into the first growth-medium container 26 and also through which the plant is growable. The plant is able to grow vertically or substantially vertically from the first growth-medium access aperture 62 of the first growth-medium container 26.

It is feasible that the first growth-medium containers 26 are not in direct contact with the secondary nutrient reservoir 54 and are instead spaced from the secondary nutrient reservoir 54 so that the plants may be watered aeroponically.

The primary nutrient reservoir 48 can be seen in Figures 3 and 4, and in the present embodiment, the pump 42 is located therein. The primary nutrient reservoir 48 acts as the main source of nutrient liquid NL in the stackable hydroponic apparatus 10, and preferably feeds all of the first demountable plant module 20. Figure 3 shows a first stage of a recirculating nutrient flow path P. The pump 42 draws in nutrient liquid NL, which is pumped via the pump outlet 50 into the feeder manifold 40 and fed into the individual first growth-medium containers 26 via the nutrient inlet port 58.

Figure 4 shows the second stage of the recirculating nutrient flow path P. Nutrient liquid NL drains from the first growth-medium containers 26 via the drainage apertures 60 into the secondary nutrient reservoir 54, which in turn drains under gravity into the primary nutrient reservoir 48. The drainage via an overflow port 64 is shown in more detail in Figure 5; it is noted that the upper edge of the overflow port 64 is elevated relative to the base of the secondary nutrient reservoir 54, so that the secondary nutrient reservoir 54 does not fully drain at any point.

As the primary nutrient reservoir 48 forms part of the base unit 12, and thus the primary nutrient reservoir 48 is located at or near the base of the stackable hydroponic and/or aeroponic planter 10.

In a fully pumped system, it will be appreciated that the primary nutrient reservoir need not necessarily be positioned at the base of the stackable hydroponic and/or aeroponic planter 10, provided that it is somewhere on the recirculating nutrient flow path P. Figure 5 shows the secondary nutrient reservoir 54 in more detail, showing how it extends into the housing 14 and is preferably spaced apart from the primary nutrient reservoir 48. The secondary nutrient reservoir 54 is preferably provided as a container with an open top which is configured to align with a counterpart first demountable plant module 20.

It will be appreciated that, whilst primary and secondary nutrient reservoirs 48, 54 are provided, nutrient liquid NL could drain from the first growth-medium containers 26 directly into the primary nutrient reservoir 48. However, the provision of the secondary nutrient reservoir 54, and in particular a lateral offset of the overflow port 64 with respect to the first growth-medium containers 26, inhibits ingress of growth medium into the primary nutrient reservoir 48 and thus the pump 42.

It is preferable that the overflow port 64 is located proximal to a wall of the secondary nutrient reservoir 54 so that the overflow port 64 is spaced apart from the first growth-medium container 26.

The overflow port 64 preferably comprises port walls which extend into the secondary nutrient reservoir 54. It is also preferable that the port walls are parallel to the wall of the secondary nutrient reservoir 54. The port walls therefore allow the nutrient liquid NL to fill the secondary nutrient reservoir 54 before the nutrient liquid NL exits the secondary nutrient reservoir 54.

An exemplary first demountable plant module 20 is shown in Figures 6 and 7. The first demountable plant module 20 is dimensioned to support the first growth-medium container 26 and thus supports a plant. The said first demountable plant module 20 is preferably supportable by the capping element 16 and thus the first demountable plant module 20 is preferably stacked on top of the capping element 16.

In the depicted embodiment, the first demountable plant module 20 preferably has a substantially rectangular cross section in a plane parallel to the mounting plane Ml, though it will be apparent that this shape will be dictated by the complementary shape of the first growth-medium container 26.

The first demountable plant module 20 preferably further comprises a first growth-medium-container receiver 66 configured to receive the first growth-medium container 26. The first growth-medium-container receiver 66 is preferably an aperture dimensioned to receive the first growth-medium container 26, though it may comprise a keyway or similar locking means for secure receipt of the first growth-medium container 26 therein.

The first demountable plant module 20 may preferably comprise a portion of the liquid delivery element 68 within a delivery wall of the module housing 70 of the first demountable plant module 20. This liquid delivery element 68 would then couple with the feeder manifold 40 of the base unit 12 in use. There may be an angled portion of the liquid delivery element 68 within the first demountable plant module 20 for correct alignment with the nutrient-inlet port 58 of the first growth-medium container 26. It will be appreciated that, whilst the liquid delivery member 68 is here defined as the conduit component of the first demountable plant module 20, it could be any of the upper fluid conduit portions, including the feeder manifold, for instance.

The first demountable plant module 20 preferably includes a retaining lip 56, as best seen in Figure 7, into which the first growth-medium container 26 is seated in-use.

The first growth-medium container 26 is preferably removeable from the first demountable plant module 20 via a user lifting the first growth-medium container 26 at said the retaining lip 56 via an access portion 72.

The connection between the pump 42, via a pumping conduit 73, the feeder manifold 40, a liquid conduit 74 which may preferably be formed or positioned in the capping element 16, and the liquid delivery element 68 of the first demountable plant module 20 is shown in Figure 8. The liquid delivery element 68 is therefore capable of at least in part vertical transfer of nutrient liquid NL through the hydroponic and/or aeroponic planter 10. The feeder manifold 40 includes engagement port 41 which is receivably engageable with a complementary engagement socket 75 of the liquid conduit 74 of the capping element 16, the liquid conduit 74 having an engagement plug 76 which in turn engages with an engagement receiver 77 of the first demountable plant module 20.

This connection method allows for rapid engagement of the first demountable plant module 20 with the feeder manifold 40 to thereby create the recirculating nutrient flow path P. This ensures that a modular 'plug-and-play' system is created. The engagement receiver 77 is a moulded component, ideally with a seal 79 such as the cylindrical seal shown. Alternatively, an 0-ring or similar seal could be associated therewith, dimensioned to fluid-tightly interface with the engagement receiver 77. The illustrated seal 79 has a detent portion which is engagable with the engagement receiver 77 to inhibit inadvertent disassembly.

Whilst the plug-and-socket type arrangement herebefore described is one suitable means of modular connection of the recirculating nutrient flow path P without needing specialist fasteners or connectors, it will be apparent that other means of providing a fluid-tight recirculation system could be provided. For instance, click connectors or detent type fasteners could be used. For a truly simple modular system, it is preferred that there is toolless engagement between any or all of the first demountable plant module 20, the capping element 16, and the feeder manifold 40.

The stackable hydroponic and/or aeroponic planter 10 is preferably in the form of a kit of parts. Therefore, the stackable hydroponic and/or aeroponic planter 10 is modular and assembleable by the user or the manufacturer. As such, it can be constructed according to the user's needs.

The housing 14 of the base unit 12 is placed on a surface, such as the floor or a wall, which the user would like the stackable hydroponic and/or aeroponic planter 10 to be located. The capping element 16, if a separate component, is placed onto the housing 14 and supported thereby.

The first demountable plant modules 20 are then installed on the capping element 16, being inserted into the module receivers 30 thereof.

The growth-medium containers 26 are placed into the corresponding first demountable plant modules 20. The retainers 56 of the first demountable plant modules 20 respectively secure the first growth-medium containers 26 in place within the stackable hydroponic and/or aeroponic planter 10.

Growth medium is inserted and thus held within the first growth-medium containers 26.

The said growth medium is preferably a porous medium such as peat moss, perlite, and vermiculite. Seeds and/or seedlings are inserted into the growth medium.

The housing 14 of the base unit 12 is opened, typically via the slidable element 52. and nutrient liquid inserted into the primary nutrient reservoir 48 sufficiently to submerge the pump 42.

The pump 42 is then activated by providing electricity thereto. This initiates the nutrient liquid NL circulation. This would also typically activate the light-emitting device 18.

The pump 42 urges nutrient liquid under suitable pressure along the recirculating nutrient flow-path P. Nutrient liquid NL is drawn into the pump 42 and urged to the feeder manifold 40. The nutrient liquid NL is then supplied to the first demountable plant modules 20.

Nutrient liquid NL is subsequently delivered to the first growth-medium containers 26.

The nutrient liquid NL saturates the growth medium and excess nutrient liquid drips through the drainage apertures 60 of the first growth-medium containers 26 down into the secondary nutrient reservoir 54 under gravity.

Once the secondary nutrient reservoir 54 is full of nutrient liquid NL, the excess nutrient liquid NL exits the secondary nutrient reservoir 54 via the overflow port 64. The overflow port 64 thus returns the nutrient liquid NL to the primary nutrient reservoir 48 where the nutrient liquid NL is recirculated into the recirculating nutrient flow-path P. It is noted that the term reservoir is not intended to imply the presence of nutrient liquid, merely the capacity to store said nutrient liquid NL.

The advantage of the present invention is the capacity to integrate further modules to increase planting capacity. A second embodiment of stackable hydroponic and/or aeroponic planter is shown in Figures 9 and 10, in which a tiered structure is created. Identical or similar reference numerals are used to refer to identical or similar components as previously described, and further detailed description is omitted for brevity.

A plurality of second demountable plant modules 120 is provided, stacked on the capping element 16 of the base unit 12 via the module receivers 30. Each illustrated module tower 178 comprises three second demountable plant modules 120 stacked on top of one another, with a first demountable plant module 20 being positioned to crest the module tower 178.

In the depicted embodiment, there are two pairs of module towers 178, spaced apart by a central chasm through which the length-adjustable mount 24 of the light-emitting device 18 extends.

Each of the second demountable plant modules 120 is associated with a second growth-medium container 126 which, as detailed below, is positioned at an angle with respect to the mounting plane M1 of the first demountable plant module 20.

A second demountable plant module 120 is illustrated in isolation in Figures 11 and 12.

A base of the second demountable plant module 120 is supportable by the capping element 16, being formed having upstanding walls of the module housing 170 to provide height for the second demountable plant module 120 when compared with the first demountable plant module 20. One said wall includes, associated therewith, a liquid delivery element 168 having an engagement receiver 177 at a lower end thereof, and an engagement connector 181 at an upper end thereof.

The second demountable plant module 120 has a second growth-medium container receiver 166 positioned in a front wall thereof, into which the second growth-medium container 126 and lid 29 is receivable. The lid 29 for the second growth-medium container 126 may be identical to that for the first growth-medium container 126. Indeed, the first and second growth-medium containers 26, 126 may be identical to one another as well; however, different first and second growth-medium containers 26, 126 may be necessary based on dimensional constraints.

The addition of the second demountable plant module 120 lifts the first growth medium container 26 out of the secondary nutrient reservoir 54 and thus the first growth medium container 26 and the secondary nutrient reservoir 54 are spaced apart. A second growth-medium container 126 is also preferably spaced from the secondary nutrient reservoir 54. This spaced apart relationship converts the stackable hydroponic planter 10 into a hybrid hydroponic-and-aeroponic planter.

There may preferably be a liquid atomizing element in liquid communication with the liquid delivery element such that the nutrient liquid NL is sprayed aeroponically by the liquid atomizing element. The nutrient liquid NL is thus preferably deliverable to the roots of the plant held in the first and/or second growth-medium container 26, 126.

The second growth-medium container receiver 166 has an angled internal wall 180, having a further overflow port 164 therein. The internal wall 180 thereby forms a tertiary nutrient reservoir 182 above.

The second demountable plant module 120 preferably includes a tertiary nutrient reservoir 182, illustrated in Figure 12, which preferably extends over the second growth-medium container 126 in use.

The tertiary nutrient reservoir 182 of the secondary demountable plant module 120 preferably contains nutrient liquid NL for the plant in a further secondary demountable plant module 120 to be watered. This creates the tiered structure illustrated in detail in Figures 13 to 15. The said further secondary demountable plant module 120 is preferably mountable onto the secondary plant module 120 to allow the user and/or the manufacturer to decide the height of the hybrid hydroponic-and-aeroponic planter 110.

The angle of the internal wall 180 is preferably acute with respect to the mounting plane Ml, and accordingly, there is a further mounting plane, M2 created for each second growth-medium container 126. Said further mounting plane M2 is preferably perpendicular to the internal wall 180. The angle of the internal wall 180 promotes the collection of excess nutrient liquid NL from the recirculation nutrient flow-path P so that the nutrient liquid NL is prevented and/or inhibited from exiting the tertiary nutrient reservoir 182 before the tertiary nutrient reservoir 182 is full.

The tertiary nutrient reservoir 182 preferably further comprises a well portion 184. The said well portion 184 may provide a greater volume to the tertiary nutrient reservoir 182 so that the tertiary nutrient reservoir 182 is able to collect a greater volume of nutrient liquid NL before overspilling through the further overflow port 164. It may also provide a settling region for particulate matter.

Of course, the internal wall 180 defining the tertiary nutrient reservoir could extend in parallel to the mounting plane Ml, if desired.

In use, the lowermost second growth-medium container 126 is preferably spaced apart from the secondary nutrient reservoir 54. The second growth-medium container 126 of the further second demountable plant module 120 is preferably spaced apart from the tertiary nutrient reservoir 182.

The second growth medium container 126 preferably extends into the second module housing 170. The second growth medium container 126 is preferably removable from the said second growth-medium-container receiver 166; however, it is feasible that the second growth medium container 126 is integrally formed with the second module housing 170.

A growth-medium access aperture 162 of the second growth-medium container 126 is preferably at an angle to the mounting plane Ml, instead extending in the further mounting plane M2. The said angle is preferably acute so that the second growth-medium container 126 retains the nutrient liquid NL before the nutrient liquid NL exits the second growth medium container 126 via the drainage apertures 160.

The further overflow port 164 is preferably located in the internal wall 180, towards the top of the tertiary nutrient reservoir 182. The further overflow port 164 preferably comprise port walls which extend into the tertiary nutrient reservoir 182.

It is also preferable that an entry portion of the further overflow port 164 is parallel with the angled internal wall 180 forming the tertiary nutrient reservoir 182.

The further overflow port 164 forms part of the recirculating nutrient flow-path P, when in use.

A further nutrient-inlet port 158 is preferably liquidly communicable with the further overflow port 164. The further nutrient-inlet port 158 is preferably an aperture entering into the second growth-medium container 126.

The liquid delivery element 168 preferably comprises the releasable connector, such as the engagement receiver and connector 177, 181, in the delivery wall of the second demountable plant module 120. The releasable connector preferably enables the second said growth-medium container 126 to be stackably insertable between the base unit 12 and the first said growth-medium container 20. In other words, the liquid delivery elements 68; 168 combine to form a continuous, vertical or substantially vertical, liquid delivery element for the whole stackable hydroponic and/or aeroponic planter 110.

Therefore, the releasable connector preferably allows the first demountable plant module 20 and the second demountable plant module 120 to be stackably engaged with the capping element 16 and maintain a suitable seal for the recirculating nutrient flow-path P to flow.

The liquid delivery element 168 is preferably fully connected and sealed by stacking the first demountable plant module 20 onto the second demountable plant module 120 and finally on the capping element 16, or vice versa.

As such, the stackable hydroponic planter 10 is adapted to become a hydroponic-andaeroponic planter 110. The method of assembly is outlined below.

The stackable hydroponic planter 10 is adapted to become a hydroponic-and-aeroponic planter 110 via preferably inserting at least one second demountable plant module 120 between the base unit 12 and the first demountable plant module 20. The lowermost second growth-medium container 126 is spaced apart from the secondary nutrient reservoir 54 by an air gap, and further second growth-medium containers 126, and the first growth-medium container 26 are respectively spaced apart from the tertiary nutrient reservoirs 182 thereunder.

The liquid delivery elements 68, 168 of or associated with the first and second demountable plant modules 20, 120 interconnect in a fluid-fight manner, and thus pumped nutrient liquid NL is urged by the pump 42 into the first demountable plant module 20 at the top of the module tower 178. Nutrient liquid NL then filters down through the module tower 178 in a similar manner to that previously described.

The nutrient liquid NL enters into the first growth-medium container 26 via the nutrient inlet port 58, and percolates through to drip from the drainage apertures 60, into the tertiary nutrient reservoir 182 below. Once the tertiary nutrient reservoir 182 fills to the further overflow port 164, nutrient liquid NL enters into the second growth-medium container 126 thereunder, via the counterpart nutrient inlet port 158.

If there is a plurality of secondary demountable plant modules 120 stacked on top of one another, excess nutrient liquid NL drips through the plurality of drainage apertures 160 of the second growth-medium containers 126 down into an additional tertiary nutrient reservoir 182 under gravity.

Nutrient liquid NL percolates down the tower in this manner, until it reaches the lowermost second growth-medium container 126, with drainage occurring through the drainage apertures 160 into the secondary nutrient reservoir 54. Nutrient liquid NL drains through the overflow port 64 into the primary nutrient reservoir 48, and the circulation begins again.

Referring to Figure 16, there is shown a third embodiment of the stackable hydroponic and/or aeroponic planter, referenced globally at 210. Like references refer to the same or similar parts, and therefore further detailed description is omitted for brevity.

This embodiment of the stackable hydroponic and/or aeroponic planter 210 includes a third demountable plant module 220 suitable for germination of seedlings. The assembly process is, however, identical or substantially identical to that previously indicated.

The third demountable plant module 220 is best seen in Figures 17, 18, and 19. In this embodiment, the first, the second and the third demountable plant modules 20, 120, 220 are arranged in stacked formation on the base unit 12, with the third demountable plant module 220 being mounted on the base unit 12. The third demountable plant module 220 is preferably different to the first and second demountable plant modules 20, 120 The third demountable plant module 220 preferably comprises a third module housing 270, having a greater width and/or height than previous module housings, and which releasably supports an associated third growth-medium container 226.

The third demountable plant module 220 preferably further comprises an additional said growth-medium access aperture 262 for the third growth-medium container 226, which is also at an angle to the mounting plane M1 of the base unit 12, thereby defining an additional mounting plane M3. This mounting plane M3 may be at a different angle to the said further mounting plane M2 as well. The additional growth-medium access aperture 262 is configured to receive a wicking element 286, supported by a frame member 288 received within the additional growth-medium access aperture 262.

An internal wall 280 of the module housing 270 of the third demountable plant module 220 extends above the third growth-medium container receiver 266, thereby forming a further tertiary nutrient reservoir 282.

The module housing 270 also includes a liquid delivery element 268, capable of being stackably connected to other liquid delivery elements of alternative modules once stacked.

An additional overflow port 264 is provided in the internal wall 280. The additional overflow port 264 preferably also forms part of the recirculating nutrient flow-path P in much the same manner as the further overflow port 164 of the second demountable plant module 120.

The liquid delivery element 268 preferably comprises the releasable connector in the delivery wall of the third demountable plant module 220, such as the engagement receiver and connector 277, 281. The releasable connector preferably enables the third said growth-medium container 226 to be stackably insertable between the base unit 12 and the first and/or second said growth-medium container 26, 126. Of course, the second and third demountable plant modules 120, 220 could be stacked in any desirable configuration according to the user's needs; it is the first demountable plant module 20 which acts as a topmost module in each tower.

It is preferable that the additional overflow port 264 is fluidly communicable with an additional nutrient-inlet port 258.

The said third growth-medium container 226 of the third demountable plant module here comprises a wicking element 286. The wicking element 286 is preferably a porous member, such as a sponge, which is able to be saturated with nutrient liquid. The wicking element 286 is also preferably able to support seed and/or seedlings as they grow from the additional said growth-medium access aperture 262.

An indicative hydroponic-and-aeroponic planter 210 is shown in Figure 20, in which a module tower 278 is provided comprising first, second and third demountable plant module 20, 120, 220 stacked in sequence from top to bottom.

The liquid delivery elements 68, 168, 268 stack in sequence to complete the recirculating nutrient flow-path P. Nutrient liquid flow from the first demountable plant module 20 to the second demountable plant module 120 via the tertiary nutrient reservoir 182.

As nutrient liquid NL percolates out of the drainage apertures 160 of the second growth-medium container 126, the additional tertiary nutrient reservoir 282 becomes filled.

Excess nutrient liquid NL then enters the additional overflow port 264 of the third demountable plant module 220 and is delivered to the wicking element 286 via the additional nutrient-inlet port 258. The nutrient liquid NL saturates the wicking element 286 and excess nutrient liquid NL drips down into the secondary nutrient reservoir 54 under gravity.

Once the secondary nutrient reservoir 54 is full of nutrient liquid NL, the excess nutrient liquid NL exits the secondary nutrient reservoir 54 via the overflow port 64. The overflow port 64 delivers the nutrient liquid NL to the primary nutrient reservoir 48 where the nutrient liquid NL is recirculated into the recirculating nutrient flow-path P. It is possible than any stacked combination of second and third demountable plant modules is possible, for example two second demountable plant modules may be stacked onto the third demountable plant module and the first demountable plant module stacked onto the upper-most second demountable plant module.

In summary, it is possible to provide a stackable hydroponic planter which is convertible into a hybrid hydroponic-and-aeroponic planter through the addition of at least one second demountable plant module and/or at least one third demountable plant module. It is therefore possible to provide an apparatus that has both hydroponic and aeroponic features, the aeroponic features being provided by stacking second and/or third demountable plant modules between the first demountable plant module and the base unit. Interconnection of the liquid delivery elements within stacked modules allows for the completion of a circulation pathway through the planter without the need for additional tools or entry inside of the planter body.

The words 'comprises/comprising' and the words 'having/including' when used herein with reference to the present invention are used to specify the presence of stated features, integers, steps, or components, but do not preclude the presence or addition of one or more other features, integers, steps, components, or groups thereof.

It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable sub-combination.

The embodiments described above are provided by way of example only, and various changes and modifications will be apparent to persons skilled in the art without departing from the scope of the present invention as defined by the appended claims.

Claims

CLAIMS1. A stackable hydroponic and/or aeroponic planter for feeding and display of plants, the planter comprising: a base unit having a housing, a primary nutrient reservoir in the housing, and a capping element having a secondary nutrient reservoir, a mounting plane being defined at or adjacent to the secondary nutrient reservoir; a pump; a demountable plant module having a growth-medium container, the demountable plant module being supportable by the capping element at or adjacent to the mounting plane; a liquid delivery element in liquid communication with the demountable plant module; a recirculating nutrient flow-path being defined by at least the primary nutrient reservoir, the secondary nutrient reservoir, the pump, the liquid delivery element and the growth-medium container; and an overflow port which is in the secondary nutrient reservoir, the overflow port being on the recirculating nutrient flow-path; the capping element being configured to receive a further demountable plant module which is different from the first said demountable plant module, the liquid delivery elements of the first and further demountable plant modules each forming part of the recirculating nutrient flow-path.
2. A stackable hydroponic and/or aeroponic planter as claimed in claim 1, wherein the pump is located in the base unit.
3. A stackable hydroponic and/or aeroponic planter as claimed in claim 1 or claim 2, wherein a plurality of said demountable plant modules are supportable in a spaced-apart relationship at or adjacent to the said mounting plane.
4. A stackable hydroponic and/or aeroponic planter as claimed in any one of the preceding claims, wherein the liquid delivery element includes a releasable connector on the recirculating nutrient flow-path to enable a further said demountable plant module to be stackably insertable between the base unit and the first said demountable plant module.
5. A stackable hydroponic and/or aeroponic planter as claimed in any one of the preceding claims, wherein the mounting plane is spaced from the primary nutrient reservoir.
6. A stackable hydroponic and/or aeroponic planter as claimed in any one of the preceding claims, wherein the growth-medium container extends into the capping element.
7. A stackable hydroponic and/or aeroponic planter as claimed in any one of the preceding claims, wherein the growth-medium container has a growth-medium access aperture which is or is substantially parallel with the mounting plane.
8. A stackable hydroponic and/or aeroponic planter as claimed in any one of the preceding claims, wherein the demountable plant module includes a module housing which releasably supports the growth-medium container.
9. A stackable hydroponic and/or aeroponic planter as claimed in claim 8, wherein the demountable plant module includes a retainer which secures the growth-medium container to the module housing.
10. A stackable hydroponic and/or aeroponic planter as claimed in any one of the preceding claims, further comprising a second demountable plant module having a second growth-medium container, the second demountable plant module being supportable by the capping element at or adjacent to the mounting plane.
11. A stackable hydroponic and/or aeroponic planter as claimed in claim 10, wherein the second demountable plant module includes a tertiary nutrient reservoir which overlaps the second growth-medium container.
12. A stackable hydroponic and/or aeroponic planter as claimed in claim 11, wherein a base of the tertiary nutrient reservoir is at an angle to the mounting plane of the base unit.
13. A stackable hydroponic and/or aeroponic planter as claimed in any one of claims 10 to 12, wherein a second growth-medium access aperture of the second growth-medium container is at an angle to the mounting plane of the base unit.
14. A stackable hydroponic and/or aeroponic planter as claimed in any one of claims 10 to 13, wherein, when the said second demountable plant module is mounted on the base unit, the second growth-medium container is spaced from the secondary nutrient reservoir, so as to form a hybrid hydroponic-andaeroponic planter.
15. A stackable hydroponic and/or aeroponic planter as claimed in any one of the preceding claims, further comprising a third demountable plant module having a third growth-medium container, the third demountable plant module being supportable by the capping element at or adjacent to the mounting plane.
16. A stackable hydroponic and/or aeroponic planter as claimed in claim 15, wherein the third demountable plant module includes a wicking element.
17. A stackable hydroponic and/or aeroponic planter as claimed in any one of the preceding claims, further comprising a light-emitting device.
18. A stackable hydroponic and/or aeroponic planter as claimed in any one of the preceding claims, in the form of a kit of parts.
19. A stackable hydroponic and/or aeroponic planter as claimed in any one of the preceding claims, wherein the first demountable plant module is a hydroponic planter module, and the further demountable plant module is an aeroponic planter module, the hydroponic planter being adapted to become a hydroponicand-aeroponic planter upon mounting of the further demountable plant module.
20. A method of converting a stackable hydroponic planter into a hydroponic-andaeroponic planter, the method comprising the steps of: a] providing a stackable hydroponic planter as claimed in any one of the preceding claims; b] engaging a further demountable plant module which is different from the first said demountable plant module with the capping element, the further demountable plant module forming a tertiary nutrient reservoir, a further growth medium container of the further demountable plant module being positioned so as to be spaced apart from the secondary nutrient reservoir; and c] engaging the first demountable plant module with the further demountable plant module to complete the recirculating nutrient flow-path, the first said growth-medium container being spaced apart from the tertiary nutrient reservoir.
21. A method as claimed in claim 20, wherein the further growth-medium container has a different orientation to the first growth-medium container.
22. A method as claimed in claim 20 or claim 21, wherein during step b], a plurality of further demountable plant modules is stacked on top of one another prior to step c].
23. A method as claimed in claim 22, wherein during step b], the plurality of further demountable plant modules comprises a plurality of the same type of demountable plant module.
24. A method as claimed in claim 22, wherein during step b], the plurality of further demountable plant modules comprises a plurality of different types of demountable plant module.