Description: (Sunset Zone 2-9,14-21,31-41, USDA Zone 4). This maple has deeply three-lobed leaves. Highly sought after for its peeling tissue-thin coppery bark. Very hardy and tough. Dense foliage wit early spring is best or after leaves fall in autumn. Correct root pruning is very important and cannot be addressed in a line or two. Please refer to your favorite bonsai book or local bonsai experts.