USPP24495P3

USPP24495P3 - Azalea plant named ‘RLH1-6P4’

Info

Publication number: USPP24495P3
Application number: US13/573,836
Authority: US
Inventors: Robert Harold Head; Lisa Jones Head
Original assignee: Heads Select Inc
Current assignee: Heads Select Inc
Priority date: 2012-10-08
Filing date: 2012-10-08
Publication date: 2014-05-27
Anticipated expiration: 2032-10-08
Also published as: US20140101807P1

Abstract

A new and distinct cultivar of Azalea plant named ‘RLH1-6P4’, characterized by its compact, upright to outwardly spreading and mounding plant habit; freely basal branching habit; dense and bushy appearance; vigorous growth habit and rapid growth rate; evergreen, persistent dark green-colored leaves that do not abscise during the winter; freely flowering habit with remontant flowering during the spring, summer and autumn; large, non-persistent semi-double to double flowers that are bright red in color with darker red-colored central spots and speckles; and excellent garden performance and temperature tolerance.

Description

Botanical designation: Rhododendron hybrida.

Cultivar denomination: ‘RLH1-6P4’.

BACKGROUND OF THE INVENTION

The present Invention relates to a new and distinct cultivar of Azalea plant, botanically known as Rhododendron hybrida, commercially referred to as an evergreen Azalea plant and hereinafter referred to by the name ‘RLH1-6P4’.

The new Azalea plant is a product of a planned breeding program conducted by the Inventors in Long Creek, Oconee County, S.C. The objective of the breeding program is to create new compact evergreen Azalea plants having dense growth habit, large attractive flowers, flowers with good temperature tolerance, consistent remontant flowering during the spring, summer and autumn, good garden performance and low and high temperature tolerance.

The new Azalea plant originated from a cross-pollination made by the Inventors in 1996 in Long Creek, Oconee County, S.C., of a proprietary selection of Rhododendron hybrida identified as code number RLH-2000-NWC, not patented, as the female, or seed, parent with a proprietary selection of Rhododendron hybrida identified as code number HO-4-OL, not patented, as the male, or pollen, parent. The new Azalea plant was discovered and selected by the Inventors as a single flowering plant within the progeny of the stated cross-pollination in a controlled greenhouse environment in Long Creek, Oconee County, S.C. in 2000.

Asexual reproduction of the new Azalea plant by semi-hardwood stem cuttings taken in a controlled greenhouse environment in Long Creek, Oconee County, S.C. since 2005 has shown that the unique features of this new Azalea plant are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the new Azalea have not been observed under all possible environmental conditions and cultural practices. The phenotype may vary somewhat with variations in environmental conditions such as temperature, daylength and light intensity without, however, any variance in genotype. The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘RLH1-6P4’. These characteristics in combination distinguish ‘RLH1-6P4’ as a new and distinct Azalea plant:

- 1. Upright to outwardly spreading and mounding plant habit.
- 2. Freely basal branching habit; dense and bushy appearance; vigorous growth habit and rapid growth rate.
- 3. Evergreen, persistent dark green-colored leaves that do not abscise during the winter.
- 4. Freely flowering habit with remontant flowering during the spring, summer and autumn.
- 5. Large, non-persistent semi-double to double flowers that are bright red in color with darker red-colored central spots and speckles.
- 6. Excellent garden performance and temperature tolerance.

Plants of the new Azalea differ primarily from plants of the female parent selection in the following characteristics:

- 1. Plants of the new Azalea have semi-double to double flowers whereas plants of the female parent selection have single flowers.
- 2. Plants of the new Azalea flower during the spring, summer and autumn whereas plants of the female parent selection only flower during the spring and autumn.
- 3. Plants of the new Azalea and the female parent selection differ in flower color as plants of the female parent selection have dark red-colored flowers.

Plants of the new Azalea differ primarily from plants of the male parent selection in the following characteristics:

- 1. Plants of the new Azalea are more mounding than and not as globose as plants of the male parent selection.
- 2. Plants of the new Azalea are more freely branching than plants of the male parent selection.
- 3. Plants of the new Azalea have semi-double to double flowers whereas plants of the male parent selection have double flowers.
- 4. Plants of the new Azalea and the male parent selection differ in flower color as plants of the male parent selection have red purple-colored flowers.

Plants of the new Azalea can be compared to the plants of ‘Robleg’, disclosed in U.S. Plant Pat. No. 15,227. In side-by-side comparisons conducted in Long Creek, Oconee County, S.C., plants of the new Azalea differed primarily from plants of ‘Robleg’ in the following characteristics:

- 1. Plants of the new Azalea were more uniform in plant shape and required less pruning to maintain a more uniform shape than plants of ‘Robleg’.
- 2. Plants of the new Azalea were more freely flowering than plants of ‘Robleg’.
- 3. Plants of the new Azalea had semi-double to double flowers whereas plants of ‘Robleg’ had single flowers.
- 4. Plants of the new Azalea and ‘Robleg’ differed in flower color as plants of ‘Robleg’ had white-colored flowers.
- 5. Plants of the new Azalea flowered during the spring, summer and autumn whereas plants of ‘Robleg’ only flowered during the spring and autumn.
- 6. Plants of the new Azalea were more cold hardy than plants of ‘Robleg’.

BRIEF DESCRIPTION OF THE PHOTOGRAPH

The accompanying colored photograph illustrates the overall appearance of the new Azalea plant showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photograph may differ slightly from the color values cited in the detailed botanical description which accurately describe the colors of the new Azalea plant. Plants used for the photograph were grown during the late summer in ground beds in a shady outdoor nursery in Long Creek, Oconee County, S.C. and under cultural practices which approximate commercial Azalea production. During the production of the plants, day temperatures ranged from 0° C. to 45° C. and night temperatures ranged from −17° C. to 38° C. Plants were seven years old when the photograph were taken.

The photograph comprises a top perspective view of a typical flowering plant of ‘RLH1-6P4’.

DETAILED BOTANICAL DESCRIPTION

The following observations and measurements describe plants grown during the late summer in three-gallon containers in a shadehouse in El Campo, Tex. and under cultural practices which approximate commercial Azalea production. During the production of the plants, day temperatures averaged 24° C. and night temperatures averaged 14° C. Plants were one year old when the detailed description was taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2007 Edition, except where general terms of ordinary dictionary significance are used.

Botanical classification: Rhododendron hybrida ‘RLH1-6P4’.
Commercial classification: Evergreen Azalea.
Parentage:
- - Female, or seed, parent.—Proprietary selection of Rhododendron hybrida identified as code number RLH-2000-NWC, not patented.
  - Male, or pollen, parent.—Proprietary selection of Rhododendron hybrida identified as code number HO-4-OL, not patented.
Propagation:
- - Type.—By semi-hardwood stem cuttings.
  - Time to initiate roots, summer.—About 25 to 30 days at temperatures of 27° C. to 30° C.
  - Time to initiate roots, winter.—About 35 to 45 days at temperatures of 16° C. to 17° C.
  - Time to produce a rooted young plant, summer.—About 60 to 70 days at temperatures of 27° C. to 30° C.
  - Time to produce a rooted young plant, winter.—About 80 to 100 days at temperatures of 16° C. to 17° C.
  - Root description.—Fine, fibrous; initially white in color becoming light brown with development.
  - Rooting habit.—Freely branching; dense.
Plant description:
- - Plant form, plant and growth habit.—Perennial and evergreen flowering subshrub; upright to outwardly spreading and mounding plant habit; vigorous growth habit; rapid growth rate; freely flowering habit with numerous semi-double to double flowers.
  - Branching habit.—Freely branching habit with lateral branches potentially developing at every node; dense and bushy appearance; pinching (removal of terminal apex) enhances lateral branch development.
  - Plant height, soil level to top of flowers.—About 35.5 cm.
  - Plant diameter, area of spread.—About 52 cm.
  - Lateral branch description.—Length: About 28 cm. Diameter at base: About 5 mm. Internode length, at fully-developed upper leaf axils: About 1 cm. Strength: Strong. Aspect: Upright to outwardly. Texture, developing: Pubescent, fine greyed orange-colored hairs. Texture, mature: Woody; pubescent, fine greyed orange to white-colored hairs. Color, developing: Close to 146B to 146C. Color, semi-hardwood: Close to 146B to 146C becoming close to 165A with development. Color, mature: Close to 165A.
  - Leaf description.—Arrangement: Alternate; simple. Leaf retention: Very good winter leaf retention has been observed on plants of the new Azalea. Length: About 4.75 cm. Width: About 2.1 cm. Shape: Oblanceolate to elliptic. Apex: Acute; mucronulate. Base: Cuneate to attenuate. Margin: Entire; ciliate. Venation pattern: Pinnate; reticulate. Texture, upper and lower surfaces: Pubescent; coriaceous, tough. Color: Developing leaves, upper surface: Close to N137A. Developing leaves, lower surface: Close to 146B. Fully expanded leaves, upper surface: Darker than 147A; venation, close to 146A. Fully expanded leaves, lower surface: Close to between 146A and 147B; venation, close to 146B. Petioles: Length: About 1.1 cm. Diameter: About 3 mm. Texture, upper and lower surfaces: Pubescent. Color, upper surface: Close to 146A. Color, lower surface: Close to 146B.
Flower description:
- - Natural flowering season.—Spring, April to May, and then remontant flowering during the summer and autumn, July to October or until frost in USDA Hardiness Zone 6.
  - Flower appearance and arrangement.—Semi-double to double rose-shaped flowers arranged upwardly to outwardly in clusters at terminals; outer whorl of five petals, central whorl with six to eight petals and inner whorl with five to ten staminate petaloids.
  - Flowering habit.—Freely flowering habit with usually about two to four flowers per cluster.
  - Flower longevity.—Flowers are durable and long-lasting; depending on the temperature, flowers last about one week on the plant; flowers not persistent.
  - Fragrance.—None detected.
  - Flower diameter.—About 7.2 cm.
  - Flower depth.—About 3.5 cm.
  - Flower buds (before showing color).—Length: About 1.4 cm. Diameter: About 7 mm. Shape: Ovoid. Color: Close to 144A.
  - Petals, outer whorl.—Length: About 4.6 cm. Width: About 3.2 cm. Shape: Broadly ovate to orbicular; roughly spatulate. Apex: Rotund; undulate. Margin: Entire; undulate, ruffled. Texture, upper and lower surfaces: Smooth, glabrous; rugulose; waxy to velvety in appearance; pubescence towards the base on the lower surface. Color: When opening and fully opened, upper surface: Close to 42A; central spots and speckles, close to 46A, 53A and 59A. When opening and fully opened, lower surface: Close to 42A and 44A.
  - Petals, central whorl.—Length: About 4.2 cm. Width: About 3.5 cm. Shape: Broadly ovate to orbicular; roughly spatulate; Apex: Rotund; undulate. Margin: Entire; undulate, ruffled. Texture, upper and lower surfaces: Smooth, glabrous; rugulose; waxy to velvety in appearance. Color: When opening and fully opened, upper surface: Close to 42A; central spots and speckles, close to 53A. When opening and fully opened, lower surface: Close to 42A and 44A.
  - Petaloids, inner whorl.—Length: About 4.4 cm. Width: About 2.6 cm. Shape: Roughly spatulate or irregular in shape. Apex: Rotund; undulate. Margin: Entire; undulate, ruffled appearance. Texture, upper and lower surfaces: Smooth, glabrous; rugulose; waxy to velvety in appearance. Color: When opening and fully opened, upper surface: Close to 42A; central spots and speckles, close to 46A and 53A. When opening and fully opened, lower surface: Close to 42A and 44A.
  - Sepals.—Arrangement: Five in a single whorl, fused at the base forming a campanulate to star-shaped corona. Length: About 7.5 mm. Width: About 4 mm. Shape: Broadly lanceolate. Apex: Acute. Base: Truncate. Margin: Entire; ciliate. Texture, upper and lower surfaces: Densely pubescent. Color, upper and lower surfaces: Close to 144A.
  - Peduncles.—Length: About 1.5 cm. Diameter: About 2 mm. Angle: Mostly upright to outwardly. Strength: Strong. Texture: Pubescent. Color: Close to 144A heavily overlain with close to 53A.
  - Reproductive organs.—Androecium: Quantity of stamens per flower: None to about five; partially transformed into petaloids. Filament length: About 1.7 cm. Filament color: Close to 53A. Anther shape: Porandrous with four oblong, tubular to lunate-shaped pollen sacks basifixed to the filament. Anther length: About 1.5 mm. Anther color: Close to 187A. Pollen amount: None. Gynoecium: Pistil length: About 3.2 cm. Stigma shape: Round to flattened (capitate). Stigma color: Close to 163A. Style length: About 2.9 cm. Style color: Close to 53A. Ovary color: Close to 146A.
  - Fruits and seeds.—Fruit and seed development have not been observed on plants of the new Azalea.
Garden performance & temperature tolerance: Plants of the new Azalea have been observed to be very tolerant to rain, wind and temperatures ranging from about −25° C. to about 45° C.; and plants of the new Azalea are suitable for USDA Hardiness Zones 6 to 9.
Disease & pest resistance: Plants have not been observed to be resistant to pathogens and pests common to Azalea plants.

Claims

It is claimed:

1. A new and distinct cultivar of Azalea plant named ‘RLH1-6P4’ as illustrated and described.