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  #21  
Old 11-03-2022, 03:29 AM
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My greenhouse is so humid
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If your plants are happy with the humidity and not having mold issues, just make certain you have good air-flow and that your plants are getting enough Calcium. Many of the orchids and tropical plants we grow in our homes would prefer high humidity but are able to tolerate lower humidity.
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  #22  
Old 11-03-2022, 09:06 AM
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The potential for “aluminum contamination” has been discussed for years. Quite a while ago I saw a chemical analysis that showed it to be lower than that of food cooked in an aluminum pot or pan.

Back to the original subject, as far as I’m concerned, there is absolutely no need to extract humidity from the greenhouse environment.

I have heard of excessive humidity being a negative where it can slow transpiration (I have never heard of this being evaluated in orchids) or lead to diseases, but I never had an observable issue in my greenhouse in PA, which rarely had a RH under 90.

What the high humidity did do was slow the drying of potting media, eliminate evaporative cooling in S/H pots, and kept the plant far more uniformly warm in the winter, all of which led to better growth.
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