I think there are two (or three) different types of orchidarium – wet/moist and semi-moist. I haven’t found any artickles about this so this is only my humple opinion. My terrarium is semi-moist type – average humidity is 70-75% (variation 54-99%) I’m not sure if any of my ‘chids are growing well there – except Tolumnias. Dendrobium aberrans, Gastrochillus, Vanda-types and Saccolabium are growing plenty of new root and leaves, but Bulbophyllums didn’t grow very well.
So you have to deside what kind of orchids you want. Then you build best possibly orchidarium for them. I did exactly opposite.
I removed the automatic rainsystem and now I’m testing ultrasonic water fogger.
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