Humidity/flowering

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Having humidity that high will negatively affect transportation. You will have to compensate with a stronger feeding. Since the leaves won't sweat as much she won't uptake as much water which will result in less nutrients being uptake as well. Also if you use carbon filters you might notice it is not as effective.

The Bot Rot is a massive problem, as if it spreads spores it could grow in your curing containers if not dried properly and molds are respiratory irritants. Chest out this VPD chart below. It tells you the sweet spots https://www.dimluxlighting.com/wp-content/uploads/2019/02/Leaf-Vapor-Pressure-Deficit-VPD-1.jpg Other then that, I don't for 100% know, but I'm theorizing that it will not allow her to respirate properly and could reduce yields a bit, as the plants release humidity and oxygen in their day to day. So if the airs is all ready saturated it would be like breathing in the same stale air in a sense. The Bud Rot is for sure you main concern though, even if the strain is said to be resilient to high RH and bud rot. 90% is like a death wish I feel, no amount of breeding can prevent that. Try community sites to get a dehumidifier like criagslist Best of Luck!

Better off growing mushies instead at 90%. How did you get to 90!?