what is diamond willow?
From Wikipedia, the free encyclopedia. Diamond willow is willow with wood that is deformed into diamond-shaped segments with alternating colors. This is most likely the result of attack by a fungus (Valsa sordida and possibly others), which causes cankers to form in the wood in response to the infection. Diamond willow is prized by wood carvers and furniture makers for its strong contrasting colors (red and white) and its sculptural irregularity of shape.