Abstract: A modular planting system for growing a plurality of plants arranged in a vertical column. The inventive device includes a plurality of modular planting units which may stacked together at various relative angular orientations to form a vertical column. Each of the modular planting units includes a center column having a pair of plant receptacles projecting from both sides of the center column. A mounting flange extends downwardly from a lowermost portion of the center column and is arranged for reception within an uppermost potion of a center column of another planting unit. In addition, a water system for dispensing water to each of the individual plant receptacles, and supporting structure for supporting the system in a vertical orientation is also provided.