Korean Mountain Ash is an excellent small tree. Tree form is oval broadening to round with age. It forms a fairly dense crown with many small branches. Unlike most Mountain Ash, the Korean Mountain Ash has simple leaves. Flowers are borne in loose clusters in mid May. Individual flowers are about 1/2" in size and are white. Fruits are also quite attractive and persist all winter. They are about 3/8" wide and 5/8" long. Fruit color is orange with a red-purple hue. Tends to flower and fruit heavily in alternate years. Bark of younger branches is very smooth, gray-brown in color with very conspicuous white lenticels. Leaves develop a clear, bright yellow fall color. The Korean Mountain Ash can reach heights of 30 feet and widths of 25 feet.