A stackable plant holder for growing one or more plants is provided. The stackable plant holder includes: (i) a plant box, (ii) a vent, and (iii) an adjustable hanger. The plant box is filled with soil. The vent is adapted to drain an excess of water into a gutter. The vent is provided at the bottom of the plant box. The adjustable hanger is adapted to be coupled to backside of the plant box to hang the plant box.