In its native habitat, weeping willow grows on river and stream banks, disturbed moist woodlands and scrubland on alluvial ground. The tree thrives best in regions with dry and warm summers and in ground that remains permanently wet. Weeping willow is also well-tolerant of extended flooding. Though the tree adapts to well-drained ground, it requires regular irrigation in these sites to avoid drought. Weeping willow tolerates a variety of soil types including alkaline, acidic, clay or loam.
Given the high water requirement of the tree, weeping willow is suggested for use near water bodies, streams, retention ponds and lakes. Avoid planting near paved surfaces as the heavy surface roots can lift concrete. Select an area receiving full sun for best growth. The tree also adapts well to partial sun sites. Prune younger trees regularly to help develop a strong structure. Weeping willow is hardy in U.S. Department of Agriculture plant hardiness zones 4 to 9.
The tree has a mature height of about 50 feet with an equal spread. The dark gray bark is heavily furrowed, and the branches divide into numerous thin, pendulous stems that grow almost to the ground. The deciduous, ½-inch wide, lance-shaped foliage is about 6 inches long. The color of leaves range from olive green to yellow-green depending on variety. All foliage has silvery undersides.
Weeping willow trees have an aggressive root system that is always in search of water sources. Avoid planting the tree in areas near known underground water sources, septic system drainages or sewer lines as the roots can cause serious damage. Tree roots are likely to spread to a distance of three times the height of the trunk. Since the trees have massive mature forms, provide adequate room for growth.