We can see more than 30 types in the Pacific Northwest. Roots trap sand and other sediment to help other trees grow in the wetland.
Roots also prevent erosion.
Birds and insects are protected in the cover of willow. Rats, birds and rabbits eat willow twigs. When animals overeat willow branches, the shoots that grow in their place are inedible. Willow branches are bendable and used to make baskets and furniture. The bark is used for twine and dye.