Soapberry Tree (Sapindus saponaria var. drummondii)Florida Native Tree with Natural Cleaning Power and Wildlife Value The Western Soapberry Tree (Sapindus saponaria var. drummondii), also known as Soap Tree, Soapnut,. It's a remarkable North American native tree with a long tradition of use as a natural soap source. Its round, golden berries are packed with saponinsplant based compounds that lather in water and clean naturally, making this tree a sustainable alternative for eco friendly laundry and