Rio Grande Cottonwood (hardy to zone 3) Populus wislizeni
Rio Grande Cottonwood is a fast growing shade tree that is known for its beautiful yellow fall foliage. When planted in full sun with plenty of water, it can handle a variety of soils.
Flowers in early spring. Be mindful of spacing as Rio Grande Cottonwood can reach 80' tall and 30' wide and will quickly outgrow small yards.