Grevillea robusta · Proteaceae
Silky Oak is a protected tree in effectively every council Pro Climbing Tree Services covers. Expect to need a tree permit, or a development application where the property is heritage listed or in a heritage conservation area.
Fern like divided leaves with a silvery grey underside, on a tall upright tree. Spectacular golden orange toothbrush flowers in late spring. Bark is dark and furrowed.
Planted widely across Sydney from the mid twentieth century, common in Lane Cove, Ryde, Hornsby Shire, Georges River and the North Shore.
Exempt on the Northern Beaches at any size, in Lane Cove under 6m and Georges River under 6m, and protected elsewhere on this list. Crews often react to the sawdust, so it is worth flagging to the client that dust control matters on this species.
Status below is for a tree on private land that has passed the council's size threshold. Heritage items, heritage conservation areas, significant tree registers, biodiversity mapping and conditions of development consent override every exemption shown here.
| Council | Status | What it means |
|---|---|---|
| Northern Beaches | No permit needed | On Council's exempt species list, so no permit is required for removal. Heritage items, heritage conservation areas and significant tree register listings still override the exemption. |
| Ku-ring-gai | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| Hornsby Shire | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| The Hills Shire | Confirm with Council | Council holds its species exemptions in a document rather than on its website, so confirm this species with Council before treating removal as exempt. Size thresholds apply in the meantime. |
| Blacktown City | Permit required | Council does not run a species exemption list. A permit is required once the tree passes the size threshold, and each tree is assessed on its own merits. |
| North Sydney | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| Willoughby | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| Lane Cove | Exempt under 6m | Exempt only below 6m in height. At or above that size a tree permit is required. Heritage listings override the exemption. |
| City of Ryde | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| Hunters Hill | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| City of Sydney | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| Inner West | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| Woollahra | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| Waverley | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| Randwick | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| Bayside | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| Georges River | Exempt under 6m | Exempt only below 6m in height. At or above that size a tree permit is required. Heritage listings override the exemption. |
| Strathfield | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
| Burwood | Confirm with Council | Council holds its species exemptions in a document rather than on its website, so confirm this species with Council before treating removal as exempt. Size thresholds apply in the meantime. |
| Canterbury-Bankstown | Permit required | Not on Council's exempt species list, so a tree permit is required once the tree passes the size threshold. |
It is native to northern NSW and Queensland rather than Sydney, which is why several councils list it as exempt. Northern Beaches exempts it outright, Lane Cove and Georges River exempt it under 6m.
This encyclopedia is a practical guide for Sydney property owners, not legal advice. Council tree rules change, and exemptions are frequently overridden by heritage listings, heritage conservation areas, significant tree registers, biodiversity mapping, endangered ecological communities and conditions attached to development consent. Always confirm the current rules with your council for your specific address before any tree work begins, or ask us to check it for you.
Photo by Haoreima via Wikimedia Commons, CC BY-SA 4.0
Our arborists work across 20 Sydney councils every week. We will identify the species, check the rules for your address and handle the permit application if one is needed.
