Populus tremula Salicaceae
European Aspen, (in Europe: Trembling Aspen or Quaking Aspen) pop-U-lus TREM-ew-la
- 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. They are dioecious - with male and female catkins on different trees.
Male catkins green and brown, 5-8 cm long, white-hairy at pollination. Female catkins 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.