Silver Oak (Grevillea robusta) is a tall, erect, fast-growing tree from Australia, widely planted in India as a shade tree on coffee and tea estates and along roads. Its fine, fern-like grey-green leaves are silvery beneath, giving the tree its name, and in spring it produces showy one-sided golden-orange flower combs rich in nectar that attract birds and bees. The straight trunk yields useful timber. Adaptable and hardy, it thrives in cooler hill regions and well-drained plains, though its surface roots and brittle wood call for careful siting.
Specifications
| Family |
Proteaceae |
| Native region |
Eastern Australia |
| Mature height |
15-30 m |
| Mature spread |
6-12 m |
| Growth rate |
Fast |
| Foliage |
Evergreen, fern-like leaves, silvery beneath |
| Flower colour |
Golden-orange |
| Flower season |
Spring (Mar-May) |
| Climate zone |
Subtropical to mild temperate |
Care guide
| Sunlight |
Full sun |
| Watering |
Moderate; drought-tolerant once established |
| Soil / mix |
Well-drained, slightly acidic soil; dislikes waterlogging |
| Temperature |
Prefers 10-35C; tolerates light frost when mature |
| Humidity |
Tolerates moderate humidity |
| Fertilizer |
Low-phosphorus feed; avoid high-phosphate fertilizers |
| Pruning |
Prune young to build strong structure |
| Repotting |
Young plants in pots; transplant to ground early |
| Propagation |
Seeds |
| Pests & problems |
Generally hardy; occasional borers |
| Toxicity / safety |
Sap/flowers may cause skin irritation |
| Difficulty |
Easy |
Uses
Grown as a shade tree on tea and coffee plantations, as a fast windbreak and avenue tree, and for soft timber; its nectar-rich flowers support birds and bees.
Growing tips
Plant in well-drained soil in full sun and avoid phosphorus-rich fertilizers, to which Proteaceae are sensitive. It performs especially well in India's cooler hill stations and plateaus.