Trouble with Vandas

[Alicia Moïse]

Live in central OH and keep several vandas in my conservatory on a humidity tray. The leaves turn yellow and fall off then it dies. What else do they need? Dendrobiums, cattelayas, phalenopsis live in the same room and are thriving. Varigated papheopedolums have healthy foliage but don't bloom. Any suggestions?

[Steve]

Do the Vandas tend to start that kind of trouble in the winter? What's the coldest that it ever gets in that conservatory? If not too cold, how is it heated?

Steve .... who grew up in central Ohio .... 30 years ago.

[Alicia Moïse]