Italian Maple (Acer opalus)

Italian Maple

Acer opalus

Its lobed leaves glow amber in autumn, a warm tapestry of seasonal change. Deciduous tree; common names: Italian Maple, Opalus Maple.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; tolerates hot, dry summer conditions in Mediterranean climates
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Watering Water deeply during prolonged dry spells; drought-tolerant once fully established
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Temperature Hardy to -10°C; withstands moderate summer heat but benefits from occasional watering in extreme dryness
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Characteristics

  • Leaf: Palmate, 3–5 lobed, glossy dark green above, pale grey-green beneath; turns yellow-orange in autumn
  • Flower: Small, yellow-green umbellate clusters, emerging before new leaf growth
  • Stem/Bark: Smooth grey bark on young trees, developing shallow fissures with maturity
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Care Guide

Watering

Water deeply every 7–10 days during dry periods to support new growth

Fertilization

Apply balanced slow-release fertilizer once in early spring. Use fertilizer with equal nitrogen, phosphorus, and potassium to support healthy foliage and root development

Eggshell powder top-dressing:Crush dried, rinsed eggshells into fine powder; sprinkle 1–2 tbsp around the base of the tree in early spring; water thoroughly to release calcium into the soil
Pruning
  • Remove dead, damaged, or crossing branches in late winter before new growth emerges
  • Thin crowded inner branches to improve airflow and light penetration
  • Shape young trees to establish a balanced, open canopy; avoid heavy pruning in summer
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no reported toxicity

Humans: Non-toxic to humans; no known adverse effects from ingestion or contact

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental shade tree for residential gardens, urban parks, and roadside plantings