I aim for 70-80% for the masdevallia.
I ran into some trouble with my setup. I have live moss covering the bottom of the case. I mist it every morning. When I keep the case closed all the time, humidity goes well into the 90s! There's no air movement in there, so the masdevallia developed the start of a fungus or rot. I think I've successfully treated that. Now I leave the lid of the case slightly open and put a little fan in it at night. What I've learned is that my masdevallia does love humidity at 70%-80%, but not with stagnant air!
I'll be interested to hear how yours does at 50-60% I have a few more masdevallia on the way and am wondering if I could grow them outside the case.
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