Catalpa is a Midwest native tree grows 40 feet to 60 feet tall, with a narrow, open, irregularly rounded crown and spreading branches. It has large, heart-shaped leaves and large clusters of fragrant, white flowers. The bark is gray-brown and becomes scaly with age. They produce pod-like capsules, 8 inches to 20 inches long, filled with winged seeds. The long, interesting seed pods persist through the winter. Northern catalpa is very adaptable to adverse conditions but has weak wood and branch structure.