Douglas Maple

Acer glabrum

Douglas Maple is a small western North American maple that grows as a multi stemmed shrub or small tree, suited to rocky, well drained sites.

Key Facts

  • Native to western North America.
  • Grows as a multi-stemmed small tree or large shrub.
  • Produces small yellowish spring flowers followed by winged samaras.
  • Common in montane and subalpine forests and on rocky slopes.
  • Often used for erosion control and wildlife cover.
  • Tolerates dry, rocky, and nutrient-poor soils once established.
  • Prefers well drained soils and can suffer in poorly drained sites.
  • Leaf color can turn orange to red in fall.
  • Can spread by suckering in some sites.

Douglas Maple is a small native maple from western North America that grows as a multi stemmed shrub or a small tree. It produces small yellowish spring flowers and winged samaras and is valued for erosion control and wildlife cover on rocky, well drained sites.

Identification

Leaves are typical maple shapes and turn orange to red in fall, giving reliable seasonal color. Plants appear as multi stemmed shrubs or small trees typically 10 to 30 feet tall with an 8 to 25 foot spread. Spring brings small yellowish flowers that develop into paired winged samaras.

Best uses and where to grow

Use Douglas Maple for naturalized hedging, slope stabilization and wildlife cover on montane or rocky sites where drainage is good. It thrives in western North American climates and suits steep banks and poor soils that many ornamental trees cannot tolerate, though warm low elevation sites may stress the plant.

Planting time and spacing

Choose a planting time when soil is workable and not waterlogged rather than a fixed month. Allow spacing that matches the expected spread, generally 8 to 25 feet depending on whether you want a single specimen or a thicket from suckering. Avoid poorly drained spots where root decline can occur.

Soil light and watering

Douglas Maple prefers well drained loam to rocky soils and tolerates dry, nutrient poor sites once established. It performs in full sun to part shade with afternoon shade beneficial in hot low elevation locations. Poor drainage causes root decline and weak growth, while established plants endure seasonal dryness.

After flowering and pruning

After spring flowering, light pruning maintains shape and removes crossing or dead stems while preserving the multistemmed habit that suits exposed sites. Coppicing can produce new stems where desired. Avoid heavy pruning in winter prone to dieback at colder, exposed sites.

Controlling spread and suckers

Some populations spread by suckering and can form thickets when left unchecked. Remove basal suckers promptly to maintain a single specimen or thin a group to preserve airflow and vigor. For erosion control allow naturalizing growth but expect wider spread over time.

Propagation and maintenance

Propagation by seed and by suckering are common. Seed benefits from cold stratification and coppicing produces vigorous regrowth. Hardwood cuttings or layering may work but results vary by clone. Monitor for site suitability and avoid waterlogged soils to reduce maintenance needs.

Frequently asked questions

How fast does Douglas Maple grow?
Growth rate varies with site and elevation. Cold high elevation sites favor slower growth and a shrub form while sheltered lower elevation sites can produce a taller small tree relatively faster.
Can Douglas Maple become invasive?
It can spread by suckering in some sites and form thickets. Manage basal shoots if you want a single specimen or allow naturalizing growth for erosion control and wildlife habitat.
Are the leaves toxic to horses and pets?
No widely reported toxicity to people or common pets is known. Some maple species can cause problems for horses when wilted leaves are eaten so verify species specific risk for livestock locally.
What soils does it tolerate?
Prefers well drained loam to rocky soils and tolerates dry, nutrient poor conditions once established. Prolonged wet or poorly drained soils cause root decline and poor vigor.
How do I propagate Douglas Maple?
Propagate by seed with cold stratification or by allowing or transplanting suckers. Coppicing regenerates stems. Cuttings and layering are possible but success varies by clone and technique.

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