Australian Native Plants

  Grevillea robusta (Silky Oak)

Grevillea robusta photo
Grevillea robusta tree

Photograph by Mario M. Some rights reserved.    (view image details)

Grevillea robusta photo
Silky Oak

Photograph copyright: oznativeplants - all rights reserved.

Growth Characteristics information is sourced from: State Flora Catalog, Government of South Australia Licensed under Creative Commons CC BY 4.0 license.


distribution map showing range of Grevillea robusta in Australia

Map is from The Atlas of Living Australia web site, licensed under Creative Commons Attribution 3.0 Australia License

Common Name
Silky Oak

Other Names
Southern Silky Oak, Australian Silver-oak

The Silky Oak is a fast-growing large upright tree. It is the largest species of Grevillea. Produces 8cm - 15cm long bottlebrush shaped racemes of golden-orange flowers in spring and summer. The leaves are dissected bipinnatifid, and look a bit like fern fronds. Leaves are 15-30 cm long with greyish white or rusty underside Trunk diameter can reach 1m. Fruits are dark brown leathery follicles, about 2cm long.

subtropical and dry rainforest environments with over 1000 mm annual rainfall

New South Wales, Queensland,

Growth Characteristics
Height (m): 8 - 20
Spread (m): 7 - 14
Soil Texture: loam, clay
Soil pH: acid soils, neutral soils, alkaliine soils
Frost Sensitivity: resistant
Minimum Rainfall (mm): 550
Flower Colour: orange
Flower Season: spring, summer

(source: SA State Flora Catalog)

Wildlife Interest
attracts honeyeaters. Also attracts possums

Common Name:Silky Oak

Relatives in same Genus
  Grevillea agrifolia
  Grevillea alpina
  Grevillea angulata
  Grevillea arenaria
  Grevillea armigera
  Grevillea asparagoides
  Grevillea asplenifolia
  Grevillea astericosa
  Grevillea baileyana
  Grevillea banksii prostrate
  Grevillea baueri
  Grevillea bipinnatifida
  Grevillea bronwenae
  Grevillea candelabroides
  Grevillea coccinea
  Grevillea concinna
  Grevillea corrugata
  Grevillea crithmifolia
  Grevillea decurrens
  Grevillea didymobotrya
  Grevillea dielsiana
  see A-Z list for more ...