Most Grevilleas prefer a freely draining soil and relatively good sunlight. Many grow well in full sun; some tolerate shade, but most of those will do better in a position with filtered light, such as under the canopy of tall trees; rather than heavy shade.
Many grow well in sands and sandy loams; but others grow equally well in clays and clay loams; provided drainage is reasonable.
If your soil is heavier (ie. Clay or clay loam); grevilleas can still do well on a slope or embankment; or where the topography is flat; consider creating mounds or raised beds to plant Grevilleas into.
Most cultivars will need minimal feeding; and too much feeding can cause burning of tissues. Don’t use strong or fast acting fertilisers. Grevilleas, like most plants in the Proteaceae family, can be particularly sensitive to phosphorus. Don’t use fertilisers high in phosphorus.
Some tolerate excessively alkaline or acid soils better than others. Consider where the species originated.
The following are more tolerant of high alkalinity than many – Grevillea Clearview David, Grevillea thelmanniana ssp preissii and Grevillea shiressii
There are some species that have tolerated periods of wet and poorly drained soil, including:
Most will respond to being watered, particularly when first planted, if conditions are hot and/or windy. Be sure the soil does not become waterlogged –don’t over water. Once a plant has established a deep and extensive root system; irrigation is usually unnecessary (except possibly in years of extended drought
Most Grevilleas come from places where temperatures rarely drop more than a few degrees below zero (Celsius).
- You can get an indication of likely cold tolerance by looking at where a species or cultivar originated
- Limited research on the subject would suggest many Grevilleas from temperate climates may tolerate temperatures to minus 4 degrees C, but could suffer below that.
Some species including the following, have been grown successfully in parts of the UK where temperatures can reach minus 10 degrees Celsius or more:
- G. acanthifolia
- G. australis
- G. juniperina
- G. rosmarinifolia