Cigar Tree" Images Browse 335 Stock Photos, Vectors, and Video Adobe Stock 10 Benefits of Having a Northern Catalpa 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 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 Ferida's Backyard: Catalpa Pros and Cons Northern Catalpa Catalpa Speciosa Deciduous Trees Cold Stream Farm