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the humidity at the rock level is 70% and humidity rises around the pot and the tree.
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It depends on your set-up and your environment, which is why I reccommended him getting an inexpensive hygrometer. In my condo in Minneapolis, when I put humidity trays under my trees, it only raised the ambient humidity around the trees by about 10%. So if the humidity in my condo was 20%, then it was 30% around the trees above the trays, which is desert-dry conditions. When I ran a whole-room humidifier in the condo, I could get the ambient humidity up to 60%, which was a vast improvement for the trees. Things in my new house are different, because of the different micro-climate in my grow room. I had to re measure everything with the new set-up. But he'll never know if he's at a good humidity unless he measures it.
If his trees are happy right now, then he might not need to worry about it. For me, I have specific species that I am trying make an acceptable environment for, and I know that my outdoor winter temps make my indoors terribly dry, so I am concerned about my ambient room humidity. It all falls down to how much effort you're willing to expend for your trees, or the specific species that you're growing.
-Centaura