Silver Dollar Gum (Eucalyptus polyanthemos)

Silver Dollar Gum

Eucalyptus polyanthemos

Round silvery leaves glow like polished coins, a soft evergreen presence. Ornamental tree; common name: Silver Dollar Gum.

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 conditions but benefits from light afternoon shade in extreme heat
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Watering Deep, infrequent watering to encourage deep root growth; allow top 15–20 cm of soil to dry completely between waterings
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Temperature Hardy to -5°C for short periods; avoid prolonged frost exposure; thrives in warm temperate to subtropical climates
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Characteristics

  • Leaf: Juvenile leaves are round, silvery-blue; adult leaves are lanceolate, gray-green with waxy protective coating
  • Flower: Clusters of small, fluffy white blooms with subtle sweet fragrance
  • Stem/Bark: Smooth, shedding bark that transitions from cream to pale brown as it matures
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Care Guide

Watering

Deep water every 7–10 days to support active growth; avoid overwatering to prevent root rot

Fertilization

Apply diluted slow-release balanced fertilizer once monthly. Avoid high-nitrogen fertilizers to prevent excessive foliage growth at the expense of flowering

Banana peel compost tea:Compost banana peels for 2–3 weeks to break down nutrients; steep in water for 24 hours, dilute 1:20 with water for root drench; discard solid peels to avoid pest infestations
Pruning
  • Remove dead, damaged, or crossing branches in late winter before new growth emerges
  • Thin dense inner foliage to improve airflow and reduce disease risk
  • Shape young trees to establish a strong, balanced canopy; avoid heavy pruning of mature specimens as they may not regrow vigorously
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; contains eucalyptus essential oils that may cause systemic distress

Humans: Ingestion causes mild nausea, vomiting, or abdominal pain; skin irritation may occur from direct contact with essential oils

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Garden Uses & Culture

Culture: Symbolizes resilience and native Australian biodiversity in landscaping

Usage: Ornamental tree for gardens and streetscapes; limited use in essential oil production for its mild, woody fragrance