Smoke Catalpa Pods Have you seen this impressive tree that produces bean pods and wondered what it was or what it could be used for? The Catalpa Tree (Catalpa bignonioides) is also No these aren't giant tree green beans, but instead the seed pod of the northern catalpa. These bean like pods can grow to be 20" long and contain numerous 1" long seeds. #haverfordcollegearboretum # Southern Catalpa (Catalpa bignonioides): Essential Guide Southern Catalpa (Catalpa bignonioides): Essential Guide Catalpa bignonioides Flowering Tree,Medicinal Herbs Cigar Tree, Southern Catalpa