Catalpa Speciosa The Garden Lady Why you should consider planting a bean tree KSNF KODE FourStatesHomepage.com 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 Meet My Nature Neighbor: The Catalpa Tree Heartspoken Harvesting catalpa tree seed pods tips needed