American Elm Tree

The American elm (Ulmus americana) is native to the eastern United States and provides an elegant, umbrella-shaped canopy and a crown of leaves that cast dense shade. "This is an iconic American tree with large specimens still present in Central Park and along the National Mall in Washington, D.C.," Watkins says. "Disease-resistant cultivars are sold in nurseries, making it possible to grow a piece of American history in your backyard."