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re grevilleas

Tim

The low-growing Grevilleas that are recommended by McKenzie as suitable for
groundcovers in California and the UK are indeed a little suspect to
recommend for general use. I think you are certainly right about UK
conditions being very tough for most, if not all, of the three species and
one hybrid listed. The same may be also true for parts of California but I
am aware of a few areas where two of the Grevilleas you listed have been
tried and do well.

For the ones I do know, Grevillea x gaudichaudi and G. aquifolium are being
grown successfully in Southern Califonia - in San Diego and Ventura
Counties. There may well be other places as well, just that I don't know of
them. I have heard of G. aquifoilium growing in Santa Cruz but the
correctness of that statement would need to be checked. The Grevillea
australis comes from areas that should make it fairly hardy in many parts
of California and maybe parts of the UK. I  would think the G. pteridifolia
should be tried in Southern California in Zones 23, 24 because,
surprisingly, other species from the northern, interior parts of Queensland
appear to grow fine in these areas even if their home conditions are vastly
different.

Both Grevilleas tried are relatively recent and more years will be needed
to verify their long term viability.

Andrew
San Diego, California
awilson@fda.net
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