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 Northern Catalpa Ohio Department of Natural Resources Polk Salad Annie Biography of Durham's Finest Tree* No. 10: Parkwood Southern Catalpa ( Catalpa bignonioides) Extension Master Gardener Volunteers of Durham County Northern Catalpa (Catalpa speciosa) organically grown flower seeds. Floral Encounters.