Planting column

A planting column comprising:

• a hollow pillar comprising an upper end portion, a lower end portion, a body portion located between the upper end portion and the lower end portion, and an accommodating chamber located in the body portion;
• wherein the upper end portion comprises a top opening communicating with the accommodating chamber;
• the body portion comprises a plurality of through holes;
• the through holes of the body portion communicate the accommodating chamber with an outside of the hollow pillar;
• the lower end portion comprises an inner surface opposite to the top opening, an outer surface, and at least one through hole penetrating through the inner surface and the outer surface;
• the through hole of the lower end portion communicates the accommodating chamber with the outside of the hollow pillar;
• wherein the planting column comprises two said hollow pillars;
• the two hollow pillars comprise a first hollow pillar and a second hollow pillar, which are different from each other;
• the upper end portion of the first hollow pillar has a placement chamber communicating with the top opening of the first hollow pillar;
• the accommodating chamber in the body portion of the first hollow pillar communicates with the placement chamber;
• the lower end portion of the second hollow pillar is detachably accommodated in the placement chamber of the first hollow pillar;
• wherein the upper end portion of the first hollow pillar comprises an inner circumferential surface, and a positioning groove located on the inner circumferential surface;
• the lower end portion of the second hollow pillar comprises an outer circumferential surface, and a positioning rib located on the outer circumferential surface and matchable with the positioning groove so that the positioning rib of the lower end portion of the second hollow pillar is insertable in the positioning groove of the upper end portion of the first hollow pillar;
• wherein the positioning groove has a vertical section extending in an axial direction of the upper end portion, and a transverse section extending in a chord direction of the upper end portion;
• the transverse section communicates with the vertical section, and the transverse section has a transition region and an embedding region;
• a first end of the transition region communicates with the vertical section;
• a second end of the transition region communicates with the embedding region, and a stopping stair part is formed at a juncture of the second end and the embedding region.