Native to China, the weeping willow tree (Salix babylonica) is easily identified by its weeping, pendulous branches that sweep the ground and its rounded form. A deciduous tree, the weeping willow grows to 50 feet in height with a 20- to 40-foot spread and does best within U.S. Department of Agriculture plant hardiness zones 6 through 8, although some nurseries claim a broader range – 4 through 9.