Quaking or Trembling Aspen

Quaking or Trembling Aspen (Populus tremuloides)

Quaking or Trembling

Aspen

(Populus tremuloides)

 

Family: Salicaceae or Willow (Poplar)

Leaves: Simple; alternate; round to broadly ovate; 1-1/2" to 3" diameter; deciduous; finely serrate margin; acute apex; glabrous; yellow-green to green, turning bright yellow to orange in fall; petiole 1-1/2" to 3" long, flattened laterally, causing leaf to flutter in the wind.

Twigs/buds: Twigs slender; glabrous; red-brown. Terminal bud 1/4" to 1/2" long, sharp-pointed, sometimes resinous, covered by red-brown overlapping scales; lateral buds smaller, curve inward.

Flowers/fruit: Fruit a capsule; narrow conical; 1/4" long; gray and hairy; seeds small, tufted, light brown.

Bark: Smooth; green-white to cream colored; becomes furrowed on older trunks.

Wood: Gray-white to light gray-brown; sapwood lighter and merges gradually into heartwood; straight grained; fine textured; growth rings unclear; diffuse-porous; used for lumber, pallets, crates, pulp, and matches.

General: Native in most of the northern and western U.S. and Canada, including higher elevations in Utah. Generally forms single aged stands through root sprouts after a fire or other disturbance; grows in clumps or "clones" that are genetically identical since stems are all attached to the same root system. Relatively short-lived. Grows in cool, moist areas. Very shade intolerant.

Landscape Use: Over-planted in Utah; also found where homes are built into native aspen areas. Native trees do well, but aspen does not like the heat and dry conditions in our lower valleys. Stressed aspens suffer from leaf scorch, leaf spot, borers, cankers, galls, occasionally iron chlorosis, and many other problems. Best grown in cooler high-mountain climates that it is used to. If grown at low elevations, avoid problems with older, larger trees by managing selected aspen sprouts in a large, mulched bed; remove stems before they get very large. Zones 3-7.

Comments & Limitations: 

- May be insect and/or disease prone, especially when stressed.
- Sucker (sprout) growth can be a problem.
- Rarely should be planted, though limited use in specific situations may be justified.

                 
 
Quaking Aspen leaves
 
Quaking Aspen with male flowers
 
Quaking Aspen crown
 
Quaking Aspen landscape
 
 
Leaves
 
Male Flowers
 
Crown
 
Landscape
 
                 
 
Quaking Aspen bark
 
Quaking Aspen with a bark carving
 
Quaking Aspen stand
 
Clonal regeneration in Quaking Aspen
 
 
Bark
 
Bark carving
 
Stand
 
Clonal regeneration