Silky Oak, Silk Oak, Silky-Bark Oak
Fast-growing and stately, Grevillea robusta (Silky Oak) is an evergreen tree of great beauty. Pyramidal when young, it develops a few horizontal limbs when older, giving it a broader top. Mature specimens produce a striking display of large, rich, bright golden orange flowers, up to 5 in. long (12 cm), in dense, one-sided spikes in spring-summer. Equally attractive is the foliage of olive-green, fern-like leaves, to 12 in. in length (30 cm), silvery underneath. Frost hardy to 16°F (-8°C), although it becomes semi-deciduous under those conditions, Silky Oak is often grown as an annual for the beauty of its foliage.
Toxicity: Grevillea plants are mildly toxic to humans, causing contact dermatitis. Exposure to bark, flowers, or leaves may lead to delayed symptoms, including intense itching, streaking, and blister formation. The toxic compounds, resorcinols (pentadecylresorcinol and tridecylresorcinol), are responsible for these reactions. Handle with gloves to avoid skin irritation. Poisonous flowers and plants: Identifying toxic risks around you
| Hardiness |
10 - 12 |
|---|---|
| Heat Zones |
3 - 12 |
| Climate Zones | 8, 9, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, H1, H2 |
| Plant Type | Trees |
| Plant Family | Proteaceae |
| Genus | Grevillea |
| Common names | Grevillea |
| Exposure | Full Sun |
| Season of Interest | Spring (Early, Mid, Late), Summer (Early, Mid, Late) |
| Height | 70' (21.3m) |
| Spread | 20' - 25' (6.1m - 7.6m) |
| Maintenance | Low |
| Water Needs | Low |
| Soil Type | Loam, Sand |
| Soil pH | Acid, Neutral |
| Soil Drainage | Moist but Well-Drained, Well-Drained |
| Characteristics | Plant of Merit, Showy, Evergreen |
| Native Plants | Australia |
| Tolerance | Drought, Deer |
| Attracts | Birds, Butterflies, Hummingbirds |
| Garden Styles | Mediterranean Garden |
| Hardiness |
10 - 12 |
|---|---|
| Heat Zones |
3 - 12 |
| Climate Zones | 8, 9, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, H1, H2 |
| Plant Type | Trees |
| Plant Family | Proteaceae |
| Genus | Grevillea |
| Common names | Grevillea |
| Exposure | Full Sun |
| Season of Interest | Spring (Early, Mid, Late), Summer (Early, Mid, Late) |
| Height | 70' (21.3m) |
| Spread | 20' - 25' (6.1m - 7.6m) |
| Maintenance | Low |
| Water Needs | Low |
| Soil Type | Loam, Sand |
| Soil pH | Acid, Neutral |
| Soil Drainage | Moist but Well-Drained, Well-Drained |
| Characteristics | Plant of Merit, Showy, Evergreen |
| Native Plants | Australia |
| Tolerance | Drought, Deer |
| Attracts | Birds, Butterflies, Hummingbirds |
| Garden Styles | Mediterranean Garden |
How many Grevillea robusta (Silky Oak) do I need for my garden?
| Plant | Quantity | |
|---|---|---|
| Grevillea robusta (Silky Oak) | N/A | Buy Plants |
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Create a membership account to save your garden designs and to view them on any device.
Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.
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