Tropicals, Woody > Grevillea > Grevillea robusta > Grevillea robusta
Grevillea robusta
Silky Oak
Origin: Native to Queensland and New South Wales, Australia.
| Family |
| Proteaceae |
| Genus |
| Grevillea |
| Species |
| robusta |
| Category |
| Tropicals, Woody |
| Type |
| Tree (evergreen) |
| Pronunciation |
| USDA Hardiness Zone |
| 11 |
| Canadian Hardiness Zone |
| Requires cool season protection under glass. |
| RHS Hardiness Zone |
| H2 |
| Temperature (°C) |
| 4 - 7 |
| Temperature (°F) |
| 35 - 45 |
| Height |
| 30-40 m |
| Spread |
| 4 - 8 M |
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Cultivars
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Description and Growing Information
Flowering Period
| General Description |
| In order to survive in poor soils Grevillea have evolved with proteoid roots. These roots which develop each season, grow into the top levels of the soil to extract nutrients. |
| Landscape |
| Patio and container plants. |
| Cultivation |
| A marginally frost hardy plant that prefers acidic growing conditions and is intolerant of wet soils. Grevillea are particularly intolerant of phosphorous so a fertilizer low in this nutrient is a must. |
| Growth |
| Medium |
| ID Characteristic |
| Deep green fern-like leaves with pale undersides. Racemes of tubular yellow flowers. |
| Pests |
| No major issues. |
| Propagation |
| By seed grafting or semi-hardood cuttings. |
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