Southern Catalpa (Catalpa bignonioides): Essential Guide How to Grow Indian Bean Tree (Catalpa) at Home Polk Salad Annie How To Grow Catalpa Trees From Seed File:Catalpa speciosa 7zz.jpg Wikimedia Commons While catalpa trees are not generally considered highly toxic, some parts of the tree, particularly the roots, are known to be poisonous according to the USDA Plants Database. The leaves and seed pods