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.
| 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.
Join now and start creating your dream garden!
