Thanks for the detailed reply! Here in St Louis the summers are hot and humid outside, and even inside our house the humidity is usually around 50% or a bit more. But in winter, with our gas heat, it plunges to 20% or under. So that's why I started keeping the orchids in old fish tanks where I could boost humidity in the winter. I find that I can keep it around 55-60% with no top on the tank using a couple of glasses of water sitting here and there among the pots. I had tried the trick of putting individual plants on trays of pebbles in water but that didn't seem to work very well. I guess it's all a process of trying this and that until something clicks. A couple of years ago I went to the local orchid show and asked one of the club members for advice about culture. He explained very patiently what he'd found worked and what didn't. When he was done, another member chimed in with completely different experiences and advice. There seems to be room for a LOT of variation here!
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