Sydney Red Gum (Angophora costata)

Sydney Red Gum

Angophora costata

Rugged, peeling bark reveals warm red tones, a landmark of Australian woodlands. Evergreen tree; common name: Sydney Red Gum.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Requires full sun for optimal growth; tolerates partial shade in hot coastal climates and withstands moderate wind exposure
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Watering Drought-tolerant once established; water deeply every 7–10 days during prolonged dry spells to support root health
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Temperature Hardy to light frost (down to -5°C); withstands high summer temperatures up to 40°C in well-drained soil
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Characteristics

  • Leaf: Opposite, lanceolate to elliptical; glossy green, aromatic when crushed
  • Flower: Clusters of creamy-white, brush-like inflorescences; nectar-rich for pollinators
  • Stem/Bark: Sheds papery outer bark to expose smooth, reddish-pink underbark that ages to grey-brown
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Care Guide

Watering

Water deeply during extended dry periods to maintain canopy health

Fertilization

Apply slow-release native plant fertilizer once at the start of growing season. Use low-phosphorus fertilizer to support native plant nutrient needs

Banana peel compost tea:Fully compost banana peels to eliminate odor; dilute 1:20 with water for root drench to support flowering and bark health
Pruning
  • Remove dead, damaged, or crossing branches in late winter to maintain structural integrity
  • Thin crowded inner canopy to improve airflow and reduce fire risk in dry regions
  • Avoid heavy pruning; minimal shaping needed to preserve the tree’s natural rounded form
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No listed toxicity to cats

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: Symbolizes resilience and native Australian biodiversity in public and private landscapes

Usage: Ornamental shade tree; nectar source for bees, birds, and butterflies; timber used for craftwork