There are a few groups of orchids (like the Catasetinae) that really do want a severe drying out (with loss of leaves) for several months. However, they still want warmth and some humidity. They are the exception... I have found that even orchids with a reputation for wanting a winter period where they get little water, like some Dendrobium groups... not all, by the way... need some water in my climate. And mounted ones in those groups seem to do fine getting regular water anyway. Oncidiums, definitely, DON'T need or want that reduction of water. They need to stay damp. And Orchidtinkerer is spot-on that cold+wet is a bad combination. I water in the morning, so plants have a chance to dry out a bit before evening - especially outside where it can get quite chilly. Indoors, if warm, that's less of a consideration but even indoors it's typically cooler in the evening than during the day so morning watering is still a good practice.
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