Orchids on a Wabi Kusa Wall

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What’s the average humidity in the room?

Hygrolon is tricky, it’s often either too wet or too dry (for orchids - marginal plants do well on it when it’s always wet). There are a few orchid species that would probably grow on it, but not if the humidity in your room is too low. All the orchids that want constantly moist roots also want ambient humidity of 75%+.