Abstract: A pair of end caps for a planter box having first and second side walls and a bottom wall, each end cap defining a first support surface having a generally vertical orientation and arranged to engage a marginal face portion at one end of the first side wall; and a second support surface having a generally vertical orientation, horizontally spaced from and facing the first support surface and arranged to engage a marginal face portion at one end of the second side wall. A plurality of holes are vertically spaced apart and intersect the first support surface, and a plurality of openings are vertically spaced apart and intersect the second support surface. The holes receive securing members that penetrate the marginal face portion at one end of the first side wall and the openings receive securing members that penetrate the marginal face portion at one end of the second side wall.