Red Silky Oak (Grevillea banksii)

Red Silky Oak

Grevillea banksii

Its feathery red blooms draw hummingbirds like living scarlet brushstrokes. Evergreen flowering shrub; common names: Red Silky Oak, Banks' Grevillea.

Full sun
1/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; full sun promotes the most abundant flowering, while partial shade is tolerated in hot, arid regions
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Watering Drought-tolerant once established; water deeply but infrequently to avoid waterlogging and root rot
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Temperature Hardy to light frost; avoid prolonged exposure to temperatures below 5°C to prevent leaf damage
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Characteristics

  • Leaf: Dark green, linear to lanceolate, up to 20 cm long, with silky, pale undersides
  • Flower: Dense cylindrical clusters of bright red, spider-like blooms with prominent curved styles
  • Stem: Woody, branching stems with gray-brown, slightly fissured bark
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Care Guide

Watering

Water deeply every 7–10 days during extended dry spells

Fertilization

Apply diluted low-phosphorus fertilizer once monthly. Use fertilizer formulated for native Australian plants to avoid phosphorus toxicity

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours, dilute 1:20, and apply as a root drench to support flowering
Pruning
  • Deadhead spent flower clusters immediately after blooming to encourage repeat flowering
  • Thin overcrowded branches in early spring to improve airflow and reduce disease risk
  • Prune lightly after flowering to maintain a compact, rounded shape; avoid heavy pruning that removes old wood
  • Remove damaged, diseased, or crossing stems as needed to promote healthy growth
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; contains cyanogenic glycosides that may cause vomiting, diarrhea, lethargy, and abdominal pain

Humans: Ingestion of large amounts may cause mild gastrointestinal upset, including nausea and vomiting

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Garden Uses & Culture

Culture: Symbolizes resilience and native biodiversity in Australian garden design

Usage: Ornamental garden shrub; nectar source for hummingbirds, bees, and native Australian pollinators