Plantae > Tracheophyta > Magnoliopsida > Proteales > Proteaceae > Grevillea > Grevillea robusta

Grevillea robusta (silkoak; silky oak; silver oak)

Synonyms: Grevillea robusta var. compacta (homotypic); Grevillea umbratica (homotypic); Grevillea venusta (heterotypic); Hakea robusta (homotypic); Stylurus robusta (homotypic)

Wikipedia Abstract

Grevillea robusta, commonly known as the southern silky oak or silky oak, or Australian silver oak, is the largest species in the genus Grevillea of the family Proteaceae. It is not closely related to the true oaks, Quercus. It is a native of eastern coastal Australia, in riverine, subtropical and dry rainforest environments receiving more than 1,000 mm per year of average rainfall.
View Wikipedia Record: Grevillea robusta

Invasive Species

View ISSG Record: Grevillea robusta


Air Quality Improvement [1]  None
Allergen Potential [1]  Medium
Carbon Capture [1]  High
Screening - Summer [2]  Dense
Screening - Winter [2]  Dense
Shade Percentage [1]  83 %
Temperature Reduction [1]  Medium-Low
Wind Reduction [1]  Medium-Low
Bloom Period [2]  Summer
Drought Tolerance [2]  Medium
Edible [3]  May be edible. See the Plants For A Future link below for details.
Fire Tolerance [2]  Low
Flower Type [3]  Hermaphrodite
Frost Free Days [2]  1 year
Fruit/Seed Abundance [2]  Low
Fruit/Seed Begin [2]  Fall
Fruit/Seed End [2]  Winter
Growth Form [2]  Single Stem
Growth Period [2]  Spring, Summer, Fall
Growth Rate [2]  Rapid
Hazards [2]  Slight Toxicity
Janka Hardness [4]  840 lbf (381 kgf) Soft
Leaf Type [3]  Evergreen
Lifespan [2]  Perennial
Pollinators [3]  Bees
Propagation [2]  Bare Root, Container, Seed
Root Depth [2]  36 inches (91 cm)
Seed Spread Rate [2]  Rapid
Seed Vigor [2]  High
Seeds Per [2]  30000 / lb (66139 / kg)
Shape/Orientation [2]  Erect
Specific Gravity [5]  0.521
Structure [3]  Tree
Usage [3]  The plant yields small quantities of a gum resin; The leaves contain rutin, though quantities are not specified; Intense yellow and green dyes are obtained from the leaves; This tree is one of the most important reafforestation trees in Nepal; This species is more resistant than other members of the genus to root-rotting fungus, it is sometimes used as a rootstock for the more susceptible species; Wood - strong, silky textured, light, easily split, durable but porous. Used for panelling, joinery, cabinet making etc; A good fuel;
Vegetative Spread Rate [2]  None
Flower Color [2]  Yellow
Foliage Color [2]  Green
Fruit Color [2]  Brown
Flower Conspicuous [2]  Yes
Fruit Conspicuous [2]  Yes
Height [3]  98 feet (30 m)
Width [3]  49 feet (15 m)
Hardiness Zone Minimum [1]  USDA Zone: 10 Low Temperature: 30 F° (-1.1 C°) → 40 F° (4.4 C°)
Hardiness Zone Maximum [1]  USDA Zone: 11 Low Temperature: 40 F° (4.4 C°) → 50 F° (10 C°)
Light Preference [2]  Full Sun
Soil Acidity [2]  Neutral
Soil Fertility [2]  Intermediate
Water Use [1]  Moderate to Low
View Plants For A Future Record : Grevillea robusta

Protected Areas



Attributes / relations provided by
1i-Tree Species v. 4.0, developed by the USDA Forest Service's Northern Research Station and SUNY-ESF using the Horticopia, Inc. plant database.
2USDA Plants Database, U. S. Department of Agriculture
3Plants For A Future licensed under a Creative Commons Attribution 4.0 License
4Wood Janka Hardness Scale/Chart J W Morlan's Unique Wood Gifts
5Chave J, Coomes D, Jansen S, Lewis SL, Swenson NG, Zanne AE (2009) Towards a worldwide wood economics spectrum. Ecology Letters 12: 351-366. Zanne AE, Lopez-Gonzalez G, Coomes DA, Ilic J, Jansen S, Lewis SL, Miller RB, Swenson NG, Wiemann MC, Chave J (2009) Data from: Towards a worldwide wood economics spectrum. Dryad Digital Repository.
6Ben-Dov, Y., Miller, D.R. & Gibson, G.A.P. ScaleNet 4 November 2009
7HOSTS - a Database of the World's Lepidopteran Hostplants Gaden S. Robinson, Phillip R. Ackery, Ian J. Kitching, George W. Beccaloni AND Luis M. Hernández
8Biological Records Centre Database of Insects and their Food Plants
9Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
10del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
11New Zealand Institute for Plant & Food Research Plant-SyNZ™ database
12The Spectacled Flying-Fox, Pteropus conspicillatus (Chiroptera: Pteropodidae), in North Queensland 2. Diet, seed dispersal and feeding ecology, G. C. Richards, Australian Mammalogy, Vol 13 Nos. 1 & 2, pp. 25-31
13Species Interactions of Australia Database, Atlas of Living Australia, Version ala-csv-2012-11-19
Abstract provided by DBpedia licensed under a Creative Commons License
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset accessed via on 2023-06-13; License: CC BY 4.0