A planter box configured for housing plantings is disclosed. The pallet box assembly includes a pallet base, two side panels, a front panel, and a rear panel, which are collapsible and reusable. Pallet base has tenon joint parts with locking mechanisms that extend out. Pallet base has an opening extending therethrough for ease of handling by pallet jack or hand truck. The side panels include grooves. Front and rear panels include tenon joint part with locking mechanism. The side panels are identical and interchangeable, the front panel is identical and interchangeable with the rear panel. Each locking mechanism includes a winged bolt threadedly inserted and engaged into the tenon joint part, and a wing which is rotated by about 45 to 135 degrees to engageably and securely attach the corresponding tenon joint part in the corresponding groove, so that the pallet box assembly is securely installed.