Southern silky oak
Grevillea robusta, family Proteaceae
A tall Australian tree with fern-like leaves and golden-orange flowers
Southern silky oak is a fast-growing tree native to eastern Australia, bearing deeply divided leaves and clusters of yellow-orange flowers marked with red. It is grown for timber, shade and nectar, but can become invasive outside its natural range.
- Flowers are golden-orange with red blotches in toothbrush-shaped clusters
- Native only to eastern Australia but widely planted overseas
- Nectar from flowers was traditionally drunk by Indigenous Australians
- Timber was once used for windows due to its rot resistance
- Contains toxic compounds and can cause skin reactions
What does Southern silky oak look like?
Southern silky oak is a tall tree that can reach up to 40 metres. Its bark is dark grey and furrowed. The leaves are long and deeply cut into many narrow lobes, giving them a feathery look. Bright golden-orange flowers appear in one-sided, brush-like clusters, often dotted with red blotches. The flowers lack hairs and are followed by smooth, oval seed pods.
Where does Southern silky oak come from?
This tree grows naturally only in eastern Australia, from southern Queensland down to Coffs Harbour in New South Wales. It was first described scientifically in 1830 by Robert Brown, based on a specimen collected near Moreton Bay in 1827. Though once common in rainforests and wet forests, it is now rare in the wild there.
When and how Southern silky oak blooms
It blooms in spring, mainly from September to November in Australia. Young trees grow quickly and do best in full sun and warm climates, though they need frost protection when small. Once mature, they tolerate light frosts and dry conditions. It is often used as rootstock to graft other grevilleas that are harder to grow.
How Southern silky oak is used
Indigenous Australians drank the sweet nectar from its flowers, either straight from the bloom or mixed into water. Its timber was once prized for window frames and furniture because it resists rot, though harvesting is now limited. It is planted for shade, especially in places like Kunming, China, and in agroforestry systems with crops like maize.
What Southern silky oak means
The tree has spread far beyond Australia and is now naturalised in places like Hawaii, South Africa and Jamaica. In some regions, including parts of Australia, it is considered a weed because it spreads easily into bushland. Its flowers and fruit contain hydrogen cyanide, and its sap can cause skin irritation.
Where Southern silky oak is used and seen
Questions people ask about Southern silky oak
Where does southern silky oak come from?
It is native to eastern Australia, growing naturally in coastal and mountain forests from southern Queensland to Coffs Harbour in New South Wales.
What do the flowers look like?
They are golden-yellow to orange with red blotches, arranged in one-sided, brush-like clusters up to 16 cm long.
Is southern silky oak safe to handle?
No. Its flowers and fruit contain hydrogen cyanide, and its sap can cause contact dermatitis due to tridecylresorcinol.
How was it traditionally used?
Indigenous Australians consumed the nectar from its flowers, either directly or shaken into water to make a sweet drink.
Why is it considered a problem in some areas?
It spreads easily and has become invasive in places like Hawaii and South Africa, and is regarded as a weed in parts of Australia.
Good reading and sources
- Encyclopaedia BritannicaArticle
- Grevillea robustaRoyal Horticultural Society, Article
- USDA Plants DatabaseUS Department of Agriculture, Article
- Plants of the World OnlineRoyal Botanic Gardens, Kew, Plant database
- Where it has been recordedGBIF, Plant database
- Sightings and photos by naturalistsiNaturalist, Plant database
- Grevillea robusta on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Grevillea robusta", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). Phool rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes. It is not medical or foraging advice: many flowers are poisonous, and traditional uses are reported, not recommended. If something is wrong, tell us. Last refreshed 2026-10-04.
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