Acer palmatum Ruby Stars also known as Beni hoshi has bright red leaves in the Spring that change to green in the summer with the second flush opening deep red over a dark green background. The closely spaced, star-shaped leaves change to yellow and orange in the autumn. Very beautiful upright dwarf Acer palmatum. Fall color in brilliant yellows and reds. Maximum size 3-4 feet in 15 years. Hardy to -20 degrees. USDA zone 5.