Hi John,

I don't know of any Grammatophyllums that are deciduous. Just don't
allow temps to drop below 65 and you will be better off. I have several
different specious and have been growing these for about 10 years. They
like indirect light and water; however, too much water may lend itself
to foliage droppage.

.. . . Pam
Everything Orchid Management System
http://home.earthlink.net/~profpam/page3.html

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Ray wrote:

John,

Grammatophyllums are not deciduous, but need very warm, very humid
conditions, or they will blow their leaves and not thrive.

They seem to do fine in S/H culture, if the other criteria are met.