Acer macrophyllum

RHS Plant Profile
Oregon maple

Other common names

big leaf maple

Trees

A large, round-headed tree with deeply-lobed, dark green leaves up to 30cm across that turn shades of orange and yellow in autumn. Small, fragrant, yellowish-green flowers are borne in drooping clusters 10-20cm long in spring and followed by bristly, winged fruit

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

Higher than 12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity
20–50 years
Max Spread
wider than 8 metres
Max Height
Higher than 12 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
East–facing or North–facing or South–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness
H6

Colour & Scent

Fragrance Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Sapindaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus
Acer can be deciduous trees or large shrubs with paired, often palmately-lobed leaves and small flowers followed by characteristic winged fruits. Many have fine autumn colour, and some have ornamental stems
Name Status
Correct

How to Grow

Cultivation

Grows best in a moist but well-drained soil in full sun or partial shade but will tolerate a wide range of conditions

Propagation

Propagate by seed

Suggested planting locations and garden types

  • Low Maintenance

Pruning

Pruning group 1

Pests

May be susceptible to Acer gall mite, aphids, caterpillars and horse chestnut scale

Diseases

May be susceptible to Verticillium wilt, Acer leaf scorch and honey fungus