Northern Catalpa (Catalpa speciosa) organically grown flower seeds. Floral Encounters. 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 Bower & Branch Northern Catalpa Underfoot: THE CIGAR TREE Northcentral Pennsylvania Conservancy