Southern Catalpa (Catalpa bignonioides): Essential Guide Ethereal smoke tree is easy to care for Carson City's Trusted News Source Since 1865 How Good Is Catalpa Firewood? Axe Adviser 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