From Oregon Flora, Gardening with Natives:
Pacific willow takes the form of a large shrub or multi-stemmed tree whose furrowed bark brings visual interest to the garden. It is a fast grower and prefers sunny spots. As with most willows, it prefers rocky to sandy soils and requires regular moisture, tolerating or thriving with seasonal flooding. Provides soil stabilization along streams and lakes as well as benefits for wildlife and wind reduction.