Acer griseum aka Paperbark Maple

Acer griseum, or paperbark maple, comes from central China. It grows in mixed woods and belongs to the Sapindaceae family. This small tree sheds its leaves each year. Growth is slow, with an upright, oval or rounded crown. Low branches may rise from a short main trunk. Most garden trees reach 20–30 feet [6.1–9.1 metres] tall. Their spread reaches 15–25 feet [4.6–7.6 metres]. Larger trees can reach about 40 feet [12 metres].

The bark gives this tree much of its garden value. Its copper and red-brown tones deepen toward purple-brown with age. Thin curls peel back but stay on the tree. They show the lighter tan or pink bark beneath. Older stems may grow rough, while some patches stay smooth. Slender brown twigs bear dark buds with sharp tips. Leaves grow in pairs, and each has three leaflets. Coarse teeth line the edges of these leaflets. Their tops look green or blue-green, with pale, downy undersides. Fine hairs also cover the leaf stalks. Fall leaves may turn orange, bronze, or deep red. Some stay green with red patches on exposed parts. The tree colors late, and leaves may linger into winter.

Small green-yellow flowers hang in short clusters as leaves open. Bloom falls between March and May, depending on the site. The flowers add little to the tree's show. Its fruit consists of paired winged samaras with hairy seeds. The wings spread apart, and ripe fruit turns red-brown. Fruit ripens in early fall and may stay through winter. Many samaras hold no sound seed. UConn reports that only about five percent can grow. Cuttings from young plants root more readily than older wood.

Grow paperbark maple in sun or part shade. It needs moist soil that drains well and dislikes drought. Sand, loam, clay, and chalk can all suit it. It prefers slight acidity but accepts a broad pH range. RHS lists a sheltered site and hardiness rating H5. US sources place it in USDA zones 4–8. RHS gives a maturity span of 20–50 years. Once planted, it needs little routine care.

Its size suits small yards, patios, and woodland edges. It can serve as a single accent or shade tree. The bare trunk and branches add interest in winter. Growers also use it for bonsai. Most sources report few serious pest or disease problems. RHS lists aphids, caterpillars, gall mites, and horse chestnut scale. Possible diseases include Verticillium wilt, leaf scorch, and honey fungus. The supplied sources give no clear food or toxicity information.