Silkoak
Grevillea robusta
- Native to:
- Australia
No machine-readable author provided. Rickjpelleg assumed (based on copyright claims).
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Proteaceae
- Genus:
- Grevillea
- Species:
- Grevillea robusta
- USDA Symbol:
- GRRO
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Tree
- Height:
- 3500 cm
- Light Requirements:
- Full Sun
- Drought Tolerance:
- High
- Bloom Months:
- apr,may,jun
- Bloom Colors:
- orange, yellow
Wildlife Benefits
- Bees:
- ★★☆☆☆ Documented bee visitation (GBIF)
- Butterflies & Moths:
- ★★★☆☆ Documented Lepidoptera association (GBIF)
- Caterpillars:
- ★☆☆☆☆ Recorded caterpillar host plant (HOSTS Database)
Host Plant for Caterpillars
Sabulodes caberata
Garden & Ecology Notes
- Wildlife Value:
- birds, bees
- Fire Ecology:
- Fire adapted — tolerates or benefits from fire
- Fire Notes:
- Mature trees resprout after fire; seeds are released from woody follicles following heat.
Soil Requirements
- Soil Type:
- well-drained, sandy to loamy soil
- pH:
- 5.5 - 7.0 (slightly acidic to neutral)
- Drainage:
- excellent drainage required
- Moisture:
- dry to moderate
- Notes:
- native to eastern Australia, prefers well-drained soils
Propagation & Germination
- Germination Time:
- 14–28 days
- Notes:
- Seeds germinate readily without pretreatment; sow in well-drained seed mix and keep warm.
ORGHPS Germination Guide: Sow @ 20C. Germinates within 3 months.
Where to Buy
Nationwide Seller
- Sheffield's Seed (seeds)