Indian Bean Tree Gardening In Pearls Southern Catalpa (Catalpa bignonioides): Essential Guide Northern Catalpa Catalpa, Northern, Catalpa speciosa Leaves for Wildlife 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 Underfoot: THE CIGAR TREE Northcentral Pennsylvania Conservancy