Sun Valley is a red maple cultivar with superior fall color and good branch structure. Winter buds, clusters of small winter spring flowers, leaf stems, twigs, and winged summer fruits are all reddish colored. The glossy green leaves persist on the tree turning orange-red to brilliant red in the fall. Red Sunset grows moderately fast, 45'-50' high with a 35'-40' spread. It adapts to a wide range of climates and soils, but requires acid soil and is salt-sensitive. It prefers a moist site and tolerates full sun to partial shade. zones 4-8.