There are no fast and solid rules for this.
I have a small terrarium (12” diameter x 15” tall glass cylinder) on my desk, containing a couple of mounted plants. I water with a hand sprayer a couple of times a day. It has an overhead LED plant light, and that’s it. There is a 2” layer of saturated LECA at the bottom.
Even with a plexiglass cover on the top that leaves a 1/2” gap in the middle, tapering to a close at its ends 3” in either direction, the plants are dry within an hour. If I leave to top off, it’s minutes.
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Hybrid Mode
