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 Northern Catalpa Tree Seeds (Naturally Grown) Meet My Nature Neighbor: The Catalpa Tree Heartspoken Underfoot: THE CIGAR TREE Northcentral Pennsylvania Conservancy