Tree aralia, the only species of the genus, is the plant equivalent of the Amur tiger. It has adapted to the freezing winters of the forest zones of north-eastern Asia although it looks more like a plant of the tropical jungle. To Finnish eyes it resembles the indoor plant fatsi (also called Japanese aralia or castor oil plant, Fatsia japonica), to which it is related. In its native habitat it grows into a massive 30-metre tree, whose trunk can exceed a metre in diameter. The trunk it covered in stout prickles, as are the branches.