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.
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