18" x 6-8' wide, (cutting propagated). 'Autumn Amber' is a superb prostrate growing form of Three Leaf Sumac originally discovered years ago in Texas. Blooming in mid-spring with an amazing abundance of chartreuse colored flowers, the plants have attractive glossy green foliage that turns an amber-yellow in the fall. 'Autumn Amber' is a welcome groundcover alternative to the creeping juniper. Developed in New Mexico at the Los Lunas USDA-NRCS Plant Materials Center. Zones 4-8.