Northern Catalpa Ohio Department of Natural Resources Catalpa bignonioides Indian Bean Tree, Southern catalpa PFAF Plant Database Catalpa speciosa, Catalpa Tree Plant Gallery NC Native Plant Society 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 The Northern Catalpa Tree Extension