Weeping willows adorn water sources across much of the United States. If you live in U.S. Department of Agriculture plant hardiness zones 2 to 9A and you have a stream, creek, lake or another source of water, a weeping willow may be an excellent addition to your landscape. Fortunately, even if you don't have a water source on your property, you can still plant a weeping willow, provided you keep it adequately watered. It is best to plant your weeping willow in the spring or fall, and avoid the summer months when the heat can cause too much stress on your tree.
Water the tree as soon as you receive it and the soil is dry. Water it until the soil is completely moist, but not soggy. If your tree came bare rooted, sprinkle some water on the roots.
Keep potted weeping willows moist until you are ready to plant them.
Water your weeping willow with about 2 to 3 inches of water after planting if it is not planted in area with moist soil, such as near a stream.
Water your trees (in drier soils) the first two to three years with at least 1 inch of water each week from spring until fall. However, if rainfall meets this need, do not water. Water under the entire canopy.
Water established weeping willows not planted near water sources with about 2 to 3 inches of water during periods of drought (e.g., more than three weeks without rain). Again, water under the entire canopy.