Purple Willow (S. purpurea): Purple willow can be found in many forms, including named varieties, most of which produce purple osiers. This is the most popular willow grown for coppice. Hardy to Zone 4.
Violet Willow (S. daphnoides): Similar to purple willow, this species grows into a tree rather than a shrub if it’s not coppiced. It is slightly more heat tolerant than purple willow. Hardy to Zone 5.
Contributing editor Barbara Pleasant grows purple willow and violet willow for coppice in her North Carolina garden.