Silky Oak (Grevillea robusta)

Silky Oak

Grevillea robusta

Its fern-like foliage sways softly, a warm evergreen canopy. Fast-growing ornamental tree; common name: Silky Oak.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; tolerates coastal wind exposure; avoid dense full shade
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Watering Water deeply when top 5–10 cm of soil is dry; drought-tolerant once established
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Temperature Hardy to light frost; prefers warm temperate to subtropical climates
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Characteristics

  • Leaf: Fern-like, pinnately divided, silvery-green underside, leathery texture
  • Flower: Orange-yellow, bottlebrush-like racemes, faintly fragrant
  • Stem/Bark: Smooth grey-brown bark when young; furrowed, rough texture with age
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Care Guide

Watering

Water regularly during active growth; avoid waterlogging

Fertilization

Apply diluted slow-release feed once. Use low-phosphorus fertilizer to support flowering without damaging root systems

Banana peel tea:Steep fully composted banana peels in water for 3 days, dilute 1:20 for root drench; avoid raw peels to prevent pest issues
Pruning
  • Remove dead or damaged branches in late winter to encourage new growth
  • Thin crowded inner branches to improve air circulation and light penetration
  • Shape young trees to maintain desired form; avoid heavy pruning of mature specimens
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxic effects to humans

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Garden Uses & Culture

Culture: Symbolizes resilience in Australian native garden design

Usage: Ornamental shade tree; cut foliage for floral arrangements