Southern Catalpa (Catalpa bignonioides): Essential Guide 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 Catalpa Tree Pods Smoke Northern Catalpa Northern Catalpa Catalpa Speciosa Deciduous Trees Cold Stream Farm Catalpa Tree Pods Smoke Northern Catalpa