The design is the features of shape, configuration and ornament of the Christmas tree holder as shown in the drawings. The variant of Figures 1-3 comprises a square base topped by a collar of square plan view. The thickness of the base is about one third of the height of the collar. The side length of the collar is about one fourth to about one third shorter than the side length of the base. The collar's walls contain an inner brim which is also square in plan view. The brim's thickness is about one third of the collar wall thickness. The design of the first variant therefore is a square shaped massive pot, open to the top, and with a wider base.In the center of the four outer faces of the collar, tiny cylindrical bolts project outwards. In the center of the four inner faces of the collar, tiny cylindrical bolts project inwards, provided at their inner end with quarter segments of a pipe segment. The outer bolts and the inner bolts of each of the four collar walls are aligned.The top of the collar is closed by a square cover plate. The thickness thereof is comparable with the thickness of the brim. It is split into two matching parts and provided with a center circular hole. The center circular hole is aligned with the center of the base and of the collar. The side length of the cover plate is a bit smaller than that of the collar.The variant of Figures 4-6 comprises a circular base topped by a collar of circular plan view. The base and the collar are aligned, whereas the thickness of the base is about one third of the height of the collar. The diameter of the collar is about one fourth to about one third smaller than the diameter of the circle formed by the base. The collar's wall contains an inner brim also with a circular plan view. The brim's thickness is about one third of the collar wall thickness. The design of the second variant therefore is a circular shaped massive pot, open to the top, and with a wider base.In the center of the outer face of the collar, four tiny cylindrical bolts project outwards. They are equally spaced from each other enclosing an angle of 90 degree.In the center of the inner face of the collar, four tiny cylindrical bolts project inwards, provided at their inner end with quarter segments of a pipe segment. The four outer bolts and the four inner bolts are aligned in pairs.The top of the collar is closed by a circular cover plate. The thickness thereof is comparable with the thickness of the brim. It is split into two matching parts and provided with a center circular hole. The center circular hole is aligned with the center of the base and of the collar. The diameter of the cover plate is a bit smaller than that of the collar.Drawings of the design are included, wherein:Figure 1 is a perspective view of a Christmas tree holder showing a first variant of the design in an open position;Figure 2 is a perspective view of the Christmas tree holder of Figure 1 in a partially closed position;Figure 3 is a perspective view of the Christmas tree holder of Figure 1 in a fully closed position;Figure 4 is a perspective view of a Christmas tree holder showing a second variant of the design in an open position;Figure 5 is a perspective view of the Christmas tree holder of Figure 4 in a partially closed position; andFigure 6 is a perspective view of the Christmas tree holder of Figure 4 in a fully closed position.