European Trembling Aspen
European Quaking Aspen
Native to (or naturalized in) Oregon:
- Broadleaf deciduous tree, to about 65 ft (20 m) in cultivation, broad crown, much branched, suckering. Bark smooth, yellow-gray. Leaves alternate, simple, oval to subovicular, 3-8 cm long, base with 2 glands, truncate or cordate, margins undulate, crenate-serrate, gray-green above, pale-green below, petiole, slender, strongly flattened. Note: The leaves on seedlings and fast-growing stems of suckers are very different, they are heart-shaped to nearly triangular, often much larger, and petioles are less flattened. The plants are dioecious - with male and female catkins on different trees. Male catkins are green and brown, 5-8 cm long, white-hairy at pollination. Female catkins ar green, 2-4 cm long at pollination, maturing in early summer to bear 10-20 capsules each containing numerous tiny seeds embedded in downy fluff ("cotton").
- Sun or part shade.
- Hardy to USDA Zone 2 Native range includes northwest Europe, north Africa, Siberia and western Asia.
- 'Erecta' - very narrow, columnar tree with upright branches, matures at about a height of 40 ft and only 7 ft wide (12 × 2.7 m)