Answer: There are about 300 sub-species of salix, and many are shrubby in growth habit. Salix aegyptiaca grows to about 12', and Salix cordata grows to about 15' at maturity. Either of these plants could suit your purpose. All willows thrive in moist, or even wet areas, but most will get along with less water once they're established. Plant your willows in a sunny site and water once each week while they're young.
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