Although I have no direct experiece, I have heard of "water walls" being used in greenhouses to cool and add humidity to the greenhouse. In this application, orchds aren't grown directly on the water wall, the wall is on one end/side of the greenhouse to regulate the intenal conditions. I don't think many if any orchids could handle the constant water flow of the wall, but I may be wrong. The water wall functions as a swamp cooler in the greenhouse.
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