Abstract: A window box 10 comprises a receptacle 12 provided with an integrally formed pair of upper sleeves 14, and an integrally formed pair of lower sleeves 36. Arms 16 are adjustably engaged within respective sleeves 14 so that distal ends 20 of each arm 16 can be positioned at one of a plurality of distances from the receptacle 12. The distal end 20 of each arm is shaped to hook over a support 22. Arms 38 are adjustably engaged in the sleeves 36 and abut the support 22 to hold the window box 10 in a vertical disposition.