Grevillea robusta (Silky Oak)
Botanical Information
| Family | Proteaceae |
| Genus | Grevillea |
| Species | robusta |
| Category | Tropicals, Woody |
| Type | Tree (evergreen) |
| Origin | Native to Queensland and New South Wales, Australia. |
| Pronunciation |
Details
| USDA Hardiness Zone | 11 |
| USDA Hardiness Ref. | |
| Canadian Hardiness Zone | Requires cool season protection under glass. |
| Canada Hardiness Ref. | |
| RHS Hardiness Zone | H2 |
| RHS Hardiness Ref. | |
| Temperature (°C) | 4 - 7 |
| Temperature (°F) | 35 - 45 |
| Height | 30-40 m |
| Spread | 4 - 8 M |
| Growth | Medium |
Description and Growing Information
| 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. |
| ID Characteristic | Deep green fern-like leaves with pale undersides. Racemes of tubular yellow flowers. |
| Landscape | Patio and container plants. |
| Propagation | By seed grafting or semi-hardood cuttings. |
| 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. |
| Pests | No major issues. |
Photographs
Grevillea robusta 'Aurea'.
Awards
