Good question. I wish that I had an answer. For me, the small tubers like Ophrys and some Orchis need an occasional spray of water during dormancy to prevent desiccation. My Habenarias, Pecteilis, Thelymitras, Diuris, and Cynorkis gibbosa are fine without any water during dormancy. All of my Cypripediums are placed in a plastic bag in the refrigerator after I moisten the potting medium so as to keep them moist all winter long.
I don't know if this is helpful because I'm sure that it varies with your microclimate.
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