Northern Catalpa Northern Catalpa Catalpa Speciosa Deciduous Trees Cold Stream Farm Catalpa Yale Nature Walk 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 A Pruning Guide for the Catalpa: When, Why & How? MOOWY The Northern Catalpa Tree Nebraskaland Magazine