Water young Grevillea robusta regularly, keeping the soil consistently moist but not waterlogged. Mature trees are quite drought-tolerant once established and require less frequent watering, only during prolonged dry spells. Allow the top few centimeters of soil to dry out between waterings for optimal health.

Prune Grevillea robusta to shape the tree, remove dead or crossing branches, and control its size. Heavy pruning can be done after flowering to encourage denser growth. Avoid pruning too late in the season to allow new growth to harden off before winter.

Grevillea robusta can be propagated from seeds sown in spring or from semi-hardwood cuttings taken in summer. Seeds require scarification or soaking before sowing. Cuttings should be treated with rooting hormone and placed in a well-draining medium.

Repot young silk oaks every 1-2 years into slightly larger containers as needed, preferably in spring. Ensure the new pot has adequate drainage. Mature trees are best left in their pots or planted out, as they dislike root disturbance.