Red Ironbark (Eucalyptus sideroxylon)

Red Ironbark

Eucalyptus sideroxylon

Rugged, iron-hard bark holds desert resilience like a weathered shield. Evergreen tree; common name: Red Ironbark.

Full sun
1/week
Moderate
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Plant Needs

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Sunlight Full sun exposure is preferred; tolerates partial shade in extreme heat to prevent leaf scorch
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Watering Drought-tolerant once established; water deeply but infrequently to encourage deep root growth
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Temperature Hardy to light frost; thrives in warm, dry climates with low humidity
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Characteristics

  • Leaf: Long, lanceolate grey-green leaves; aromatic when crushed
  • Flower: Creamy-white to pale pink clustered spherical flowers
  • Stem/Bark: Dark red-brown, deeply furrowed, iron-hard persistent bark
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Care Guide

Watering

Water deeply every 2–3 weeks once established; reduce frequency during cool spells

Fertilization

Apply a low-phosphorus, slow-release fertilizer once at the start of growing season. Avoid high-nitrogen fertilizers which can promote weak, leggy growth

Eggshell powder topdress:Crush baked, cooled eggshells into fine powder and sprinkle around the base of the tree; avoid direct contact with trunk or roots to prevent irritation
Pruning
  • Remove dead, damaged, or diseased branches in late winter before new growth emerges
  • Thin crowded inner branches to improve airflow and reduce risk of fungal disease
  • Maintain the tree's natural upright canopy shape by trimming overly long or wayward branches
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; contains eucalyptol which causes systemic distress

Humans: Ingestion of leaves or oil may cause mild gastrointestinal upset and dizziness

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Garden Uses & Culture

Culture: Symbolizes strength and endurance in Australian native landscaping

Usage: Ornamental shade tree; dense, durable timber used for construction, fencing, and firewood