Open, rounded; 20 wide feet by 30 feet tall. Slow growth rate, 6 to 12 inches per year.
Well drained, moist
Outstanding winter bark character.
Opposite, compound, trifoliolate, 3 to 6 inch long. Pubescent petiole and lower surface. Leaflets more or less uniformly serrate (see A. triflorum). Foliage emerges bronze and may turn a good red in fall.
Buds are sharply pointed, black, .125 inches long.
Copper-colored, exfoliating, very attractive.
Few or solitary, greenish yellow, on pendulous 1 inch long, pubescent peduncles, appearing with unfurling leaves.
Samara, approximately 1.5 inches with wings borne at a 60 to 90 degree angle. Fruits pubescent and woody.
Seed or cuttings, difficult. Less than 5% of the seeds on most plants are viable.
Related species A. nikoense - Beautiful tree for fall color and bark, although the bark is inferior to the other trifoliate maples. Rare in the trade. Leaf and petiole more pubescent than A. griseum. A. mandshuricum - Similar to A. nikoense and more difficult to find.