Cottonwood - "Sir William" (Populus deltoides)
Populus deltoides. Introduced by Dr. Glen Stanosz of the University of Wisconsin. 'Sir William' can grow 6-10 feet in the first year. It is not weak wooded, and grows into a healthy, sturdy, large tree that can live over 150 years. Grows well on a variety of soils, including clay. Because of its fast growth and large size (it can reach 80 feet in height!), it should be planted at least 30 ft. from any building. Resistant to all major poplar diseases, and hardier than any hybrid poplars.