Green-Ash-Tree-in-Fall Published January 14, 2013 at 350 × 341 in Ash Wood Lumber Is Popular for Woodworking but Quickly Being Threatened by Emerald Ash Borers Ash trees, whose leaves turn golden in the fall, are popular lumber sources in several different varieties throughout the United States. (Photo courtesy of Steven Katovich, USDA Forest Service, Bugwood.org)