A device for packing trees (8) and greenery on a pallet (5) or the like having lateral supports (7). The device comprises a base part (2) capable of supporting a pallet (5) and a working tower (1) protruding upwards from one side of the base part. The working tower (1) comprises a top part (15) which is movable between a horizontal position and a vertical position, and which, at least in its horizontal position, is slidable in a vertical direction to compress the trees (8) packed on the pallet. The device additionally comprises a frame (10) which at least comprises plate parts at the ends of the pallet, and which together with the lateral supports (7) of the pallet defines a delimited loading area for trees (8) and greenery. The frame (10) is vertically slidable, and the top part (15) has an extent in its horizontal position which causes trees (8) and greenery as well as the frame (10) to be pressed downwards by the top part (15) during the compression. Also described is a method of compressed packing of trees and greenery on a pallet or the like having lateral supports.