Grevillea robusta

silk oak

The largest Grevillea, a fast growing, upright tree. Thrives on neglect. Many bronze-yellow flowers in late spring early summer.

	height	30–50ft
	width	15–25ft
	tolerates	Cold, Drought, Neglect, Wind
	water needs	Lowest
	water info	Grevilleas are drought tolerant, but they’ll want infrequent additional summer water at least every couple of weeks once established. They prefer well-drained soil, but they’re less picky than some of the other proteaceous plants. After a couple years of good watering to establish, this grevillea often won’t need supplemental water if it is within a few miles of the coast.
	hardy to	18F
	exposure	Part Shade – Full Sun
	indoor outdoor	Outdoor
	drainage	In Ground: Cactus Mix, In Pots: Cactus Mix, Tolerates Heavy Soil, Tolerates Sandy Soil
	fertilizing	Low Needs
	origin	E Australia
	california native	No

Outdoor Exposure Guide

OUTDOOR EXPOSURE GUIDE

Full Sun
Six or more hours of sun beams directly landing on the plant's leaves.

Part Shade
Three to five hours of sun beams directly landing on the plant's leaves.

Part Sun
One to two hours of sun beams directly landing on the plants leaves.

Full Shade
The plant is never fully lit by sun beams, but is in a bright spot or has dappled sunbeams playing over the leaves throughout the day.

Deep Shade
The plant never has dappled light on the leaves, and is in a place that feels dim, even on a nice sunny day.

Growing Notes

This plant is known to be mildly invasive in some areas, though it does not seem particularly problematic along the central coast of California.

Commercially farmed and logged in Madagascar, where there are entire ‘forests’ of this tree, as it is fast growing and reproduces easily.