Unless you're nutrient supply has little-to-no phosphorus, that is an
unlikely reason for the coloration. Nitrogen, phosphorus, and potassium
salts are relatively cheap, so are usually in a fertilizer in abundance. I
don't know if the coloration is reversible, but it's worth a try.

The June AOS "Orchids" magazine had an article about a Michigan State
University study in which they challenged the need for high phosphorus for
blooming. Their formula has only 3% P2O5, and that's apparently enough - my
plants have seen nothing but the MSU formula for about 6 months now, and
they're all doing fine.

--

Ray Barkalow - First Rays Orchids - www.firstrays.com
Plants, Supplies, Books, Artwork, and Lots of Free Info!

.. . . . . . . . . . .
"Dave Gillingham" wrote in message
...
Thanks for your response, Ray.
After checking out "Plant Nutrition" on your website, I assume my
problem may be low phosphorus?
If so, will a higher P fertiliser reverse the colouration, or only
improve it for new growth?

On Mon, 20 Oct 2003 16:23:42 -0400, "Ray"
wrote:

I have a brief description of the functions of, and symptoms of mineral
deficiencies posted - check out "Plant Nutrition" under the Free Info
link
at the URL below.

Dave Gillingham
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