Index / Search / Grevillea robusta
§1 Plant
Grevillea robusta A. Cunn. ex R. Br.
vernacular silkoak — species · Proteaceae
§2Habit & range
Habit and range
- Growth habit
- Tree
- Duration
- Perennial
- Group
- Dicot
- Family
- Proteaceae Juss.
- Genus
- Grevillea
§2a
Native status, by region
- HI Hawaii Introduced
- L48 Lower 48 States Introduced
- PR Puerto Rico Introduced
§2b
County-level range
· 10 counties across 1 state§3Cultivation specs · USDA
Recorded by the USDA Plant Materials Program.
§3a
Tolerances
- Drought
- Medium
- Shade
- High
- Moisture use
- Medium
- Fire
- Low
- Salinity
- None
- Anaerobic
- None
- CaCO₃
- None
- Hedging
- Low
§3b
Climate & soil
- Cold tolerance
- 17 °F minimum
- Frost-free days
- 365 min.
- Precipitation
- 30–95 in/yr
- pH range
- 5.3–7
- Root depth
- 36 in min.
- Fertility need
- Medium
- Soil texture
- coarse, medium, fine
§3c
Form & growth
- Growth form
- Single Stem
- Growth rate
- Rapid
- Lifespan
- Moderate
- Mature height
- 105 ft
- Height @ 20 y
- 100 ft
- Foliage texture
- Fine
- Foliage colour
- Green
- Porosity (summer)
- Dense
- Porosity (winter)
- Dense
- Flower colour
- Yellow
- Fruit colour
- Brown
- Fire resistant
- No
- N fixation
- None
- Toxicity
- Slight
§3d
Reproduction
- Bloom period
- Summer
- Seed abundance
- Low
- Seed begins
- Fall
- Seed ends
- Winter
- Spread rate
- Rapid
- Stratify
- Yes
- Seeds / lb
- 30,000
- Propagation
- seed, bare root, container
§3e
Use & availability
- Commercial availability
- Routinely Available
- Nursery stock
- Yes
- Palatable, human
- No
- Lumber
- Yes
- Christmas tree
- No
§4Counties, by state
Recorded in 10 counties across 1 state.
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/GRRO ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/2891791 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-26
fetched 2026-05-26T09:28:40Z