Abstract: A planter (10) having a vertical rabbet (12) for conformally engaging a post (14). The planter comprises a sidewall (18) and a bottom wall (20) that together define a cavity (22) for receiving potting soil or other material for supporting one or more plants and/or other items. A first portion (24) of the sidewall extends into the cavity to define the rabbet. A second portion (26) of the sidewall is preferably circular in shape and tapered so that the cavity is generally frusto-conical in shape. The rabbet includes a front face (28), a first lateral face (30) and a second lateral face (32), each for confronting a corresponding face of the post.