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Silk Oak

Silk Oak

Grevillea robusta

tree☀️ full sun💧 low waterZone 8bZone 11b

A tall, fast-growing evergreen tree native to Australia with feathery, fern-like foliage and showy golden-orange flower clusters. Excellent for screening, windbreaks, and creating tropical effects in warm climates; commonly used as an indoor houseplant in cooler regions.

Overview

Form
Upright
Growth Rate
fast
Size
40–105′ tall × 20–40′ wide
Dormancy
evergreen

Tolerances & Soil

moderate
Zone 8bZone 11b
1471013
ColderWarmer
Zone range: Zone 8b to Zone 11b

pH Range

5.37
7.0
3.556.589
pH range: 5.3 to 7

Soil Texture

Coarse, Medium, Fine

Seasonality

Bloom Season

J
F
M
A
M
J
J
A
S
O
N
D

Season of Interest

SpringSummer

Canopy

The tallest trees that form the overstory.

Succession Role

pioneerearly successional

Native Range

Eastern Australia

Function & Care

biomass/mulchdynamic accumulatorpollinator nectarywildlife benefitwindbreak
Coppicing

Establishment & Care

Establishment
easy
Maintenance
low
Propagation
seed, cutting

Notable Cultivars

'Moonlight' is a popular cultivar with bright golden-yellow foliage; 'Silky Oak' is the standard form prized for its elegant fern-like leaves and prolific flowering.