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 Catalpa Trees: Unique Features, Uses, and Personal Experiences Underfoot: THE CIGAR TREE Northcentral Pennsylvania Conservancy Catalpa Tree Branches Pods Leaves Stock Photo 2586961485 Shutterstock Catalpa Tree Pods Smoke Northern Catalpa A Catalpa Tree in My Garden