Northern Catalpa WashU Arboretum Washington University in St. Louis Northern Catalpa: Rarely Unnoticed Harmon & Sons Catalpa Yale Nature Walk Catalpa bignonioides Indian Bean Tree, Southern catalpa PFAF Plant Database In autumn, mature catalpa seed pods turn brown and often hang on the tree through late fall and into winter. Today's @marthastewartblog looks at some of the seeds, berries, and cones of Is Catalpa Edible?