Northern Catalpa, Catalpa speciosa, is a medium to large sized native deciduous tree with showy white flowers that have bright yellow stamen and purple patterns within the flower, blooming in spring and summer from April through June. This plant is noted for its large leaves, up to 1 ft. in length, and produces long, showy, green seed pods in a bean-like capsule. Preferring full sun or part shade, they are tolerant of moist soil conditions though it prefers a moist loam with ample organic matter. However, they thrive in difficult to grow locations of the landscape, such as moist low spots or drier area with poor soil. This plant is hardier than the Southern Catalpa (Catalpa bignonioides), which blooms later, has smaller flowers and thinner-walled capsules.