I move my collection outside every summer and have found that as long as the temperatures stay fairly warm (not falling below the low 60's at night) and I don't overcrowd the plants on the benches, overwatering isn't a huge problem, especially if you have plants that come from monsoon areas of the world that are seasonally very wet anyway. I live in the Midwest and it rains a lot here also during the warm months; in addition, the humidity gets very high as well. The only plants that I've had that seem to need watching carefully when they get too wet are the members of the Catasetinae group--but that's mainly right now when their new growths are either just starting or still very small. As soon as they get taller than three or four inches and starting pushing out lots of new roots, they'll take all of the water you (or nature) can throw their way. What kind of orchids do you grow--and where are you (geographically speaking)?
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