Catalpa Trees: Unique Features, Uses, and Personal Experiences Has anyone worked with catalpa plant? TREE OF THE WEEK Newport This Week Northern Catalpa (Catalpa speciosa) organically grown flower seeds. Floral Encounters. Cigar Tree" Images Browse 334 Stock Photos, Vectors, and Video Adobe Stock 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