I'm wondering if maybe you let it go too dry for a period. My Gramm scriptum
is v. citrinum 'Hihimanu' and is in bark in a 2 gallon pot and sits under
the vandas where it's always getting good water. It sits right next to a 2
gallon pot of Angraecum sesquipedale 'Orchidglade II' (which is in
fantastic bloom right now) and an 8" pot of Angraecum eburneum superbum.
Winter night temps go down to 60 but days go to 80. It has 4 pbulbs with
leaves, 1 without, and is sending out new growth.
I'd venture a guess that it's the s/h. No reason other than:
Good Plant + New Conditions = Bad Plant
Repot the plant, put it in some warm shade until it stabilizes and/or starts
new growth. Try some very dilute fertilizer and a drop of SuperThrive as
long as the roots are good. Good Luck.
Gary

"John DeGood" wrote in message
...
I acquired an out-of-bloom (6 pseudobulbs, 6" pot) Grammatophyllum scriptum
in December when Franks Nurseries went bankrupt. I repotted it into
semi-hydroponics at that time. Several weeks ago leaves began suddenly
turning yellow and dropping within a period of days. It has now lost more
than 3/4 of its leaves, and I suspect the few remaining will soon turn
yellow and drop as well.

Although Grammatophyllum is a member of the Cymbidium Alliance, its
general form and roots seemed similar enough to the Oncidium Alliance
which I have very successfully grown in s/h that I hoped it would also
enjoy that culture. Its roots still look white and firm.

So, if there are any Grammatophyllum experts in this group, is the leaf
loss normal or am I killing this plant? Thanks!

John