All Species > Acer macrophyllum

Big Leaf Maple

Large-leafed native maple, slower to ramify; best in larger sizes or naturalistic styles.

Seasonal Care Guide

Early Summer (Jun 1 – Jun 30)

  • Watering: Deep water regularly—pots warm up quickly in heat.
  • Fertilization: Continue balanced feed every 2 weeks.
  • Pruning: If leaf size becomes excessive, consider partial defoliation.
  • Wiring: Minor wiring for refinement before tissue hardens.
  • Defoliation: Partial defoliation after first flush can reduce leaf size.
  • Pests Disease: Watch for mites; treat with horticultural oil if needed.
  • Summer Protection: Provide afternoon shade during heatwaves.

Mid Summer (Jul 1 – Aug 10)

  • Watering: Monitor daily; ensure no drought stress.
  • Fertilization: Taper nitrogen; hold feed during hottest weeks.
  • Pruning: Pinch back soft spring growth; wait until fall for structure.
  • Pests Disease: Check for powdery mildew in humid weather.
  • Summer Protection: Ensure root ball doesn’t overheat—shade or pot insulation.

Late Summer (Aug 11 – Aug 31)

  • Watering: Maintain consistent moisture as growth slows.
  • Fertilization: Apply phosphorus high feed to support root health.

Placement & Seasonal Notes

  • Placement: Full sun
  • Notes: Hardy species; prefers consistent sunlight.
  • Winter: Fully hardy but mulch roots in extreme cold.
  • Summer: Water deeply and regularly in hot weather.

Leaf Traits

  • Persistence: Deciduous
  • Form: Broadleaf

Watering & Fertilization

  • Watering: Moderate
  • Notes: Avoid waterlogging; prefers well-drained soil.
  • Season: Spring → Autumn
  • Fertilization: Balanced
  • Notes: Feed monthly in growing season; reduce in late summer.

Training Techniques

  • Wiring: Spring or Autumn
  • Notes: Branches are brittle; wire when flexible.
  • Pruning: Structural in early spring, maintenance through summer
  • Notes: Hard prune before bud break to shape.
  • Repotting: Every 2-3 years
  • Notes: Use coarse mix; avoid overpotting.

Propagation

  • Method: Cuttings or seed
  • Notes: Seedling development takes time but worthwhile.

Zone 8b Considerations

Protect roots if temps < 20 F