Common Name: bigleaf maple, Oregon maple
Origin/Ecology: Native to Pacific coast.
Habit: Medium-sized trees, up to 30 m high. In the open, trunk divides into a few large spreading and ascending limbs; crown broad and rounded.
Leaves: Very large, 15-30 (up to 60) cm wide, deeply notched; 5 lobes. Upper surface shiny dark green, paler and hairless beneath; bright orange or yellow in autumn.
Leaf Arrangement: Opposite
Flowers: Small, greenish-yellow, fragrant, in many-flowered drooping clusters. Pollen and seed flowers in same cluster, appearing before the leaves.
Water Use: Drought tolerant once established.
Soil: Generally occurs on coarse, gravelly, moist soils.
Exposure: Full sun, but will tolerate some shade.
Landscape Uses: Good for revegetation of stream banks and steep slopes thanks to massive root system. Also used as a shade tree.
Limitations: Older trees susceptible to wood-rotting fungi that enter through stem and branch wounds. Verticillum wilt is a problem for ornamental trees and sometimes kills bigleaf maple in the forest.
Other Features: Because the bark contains moisture, the trunk and larger branches are often covered with mosses, liverworts, and ferns.