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About half of all known Willow species grow as Trees, most others grow as shrubs, and some Willows grow as miniature (Alpine) Sub-Shrubs. As some species of Willow can grow as either a tree or a shrub, depending on their local habitat, this site will list the names of all Willows without regard to growth habit.
All willows are dioecious, producing male or female catkins on separate trees. Willow seeds are from fruits found only on the female trees. The trees begin to reproduce by airborne seeds after 10 years. They grow rapidly and live 55 to 70 years.