A modular planter box comprises a base panel coupled to at least four side panels to form an internal cavity for containing contents therein. The base panel includes attachment members coupled to the at least four side panels. The at least four side panels comprise a pair of opposing interlocking panels having female members and a pair of opposing support panels having male members. The female members are slidably coupled to the male members of the support panels and the attachment members of the base panel to form a collapsible, modular planter box.
