silky oak
Grevillea robusta
RHS AGM 1993
USDA zones10 to 12
SunNeeds full sun (6+ hours)
WaterHandles dry or moist soil
Size70 feet tall20 to 25 feet wide
- Bloom season
- Spring, summer
- Soil types
- Sand, loam
- Soil pH
- Acid, neutral
Garden uses
Attracts
Notes
Silky oak (Grevillea robusta) is a tree for low maintenance and xeriscape gardens. It grows outdoors year-round in USDA zone 10 and warmer, down to about 30°F (-1°C). In colder areas, grow it as a houseplant or bring it indoors for winter. This plant likes full sun and dry to moist, sandy or loamy soil. Deer tend to pass it by. It blooms in spring and again in summer, and butterflies, hummingbirds, and birds visit the flowers.
Pairs well with Jacaranda, Flamboyant, Hummingbird sage, and Australian tree fern.
Native range
Australia.