Re: grevillea triage

What time of year did you add the sulfur and iron?  What time of year did it turn brown and then green and then brown again?    It may be too much care you know.  These like things on the dry side- they are a true mediterranean plant.  Also, by acidifying the soil with sulfur and adding iron, you may have caused too much iron to be available.  Usually just the sulfur addition is enough to make the soil's resident iron available to the plant.  Some are also frost tender which might, I emphasize might, be the reason new tender growth is dead while that on the base is still okay.  What zone is she in?  The first thing I would do is cut back on the water and see if it starts to come back.
 
Karrie Reid
Folsom Foothill Gardener
UC Davis
Graduate Group in Horticulture and Agronomy
 
-------------- Original message --------------
From: N Sterman <TalkingPoints@plantsoup.com>

> I planted a Grevillea 'Long John' in a friend's garden, only to have
> its leaves turn yellow after a year or so in the ground. We applied
> soil sulfur and iron and it greened a bit, then the new growth all
> turned brown and died. My friend insisted that it had to go, so we
> replaced it with a second one.
>
> Same thing.
>
> The lower growth is green and flowering, but the new, outer growth is
> dead as a doornail.
>
> I am thinking of cutting it back and seeing if it goes through a
> second growth spurt this year
>
> The plant is in really great, well draining soil, watered regularly
> by drip irrigation. No critter damage.
>
> Any suggestions?
> !
> ; Nan
>
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