We have a Grevillea on the corner of a well drained, raised bed. It's been
there for many years but now is turning brown and dying off in patches here
and there. They're such good value plants and flower on and off for such a
long time that we're rather sad at the thought of losing this one. Is
anyone familiar with gradual dieback in these?

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Sacha
http://www.hillhousenursery.com
South Devon
(new website online but not completed - shop to come and some mild tweaking
to do!)