Late flower humidity targets before the rain hits

We're getting into the danger window out here in the PNW. Once your plants are 4-6 weeks into flower, the buds are dense enough that moisture gets trapped inside the canopy and never leaves. That's when botrytis shows up and ruins everything you worked for since May. The number I watch obsessively is 50% RH during the day, and I want it below 45% at night if I can get it. Night temps drop, dew point rises, and that's when gray mold spores germinate. If your nights are pulling high humidity and you're not doing anything about it, you're gambling. Anyways, the practical stuff: I run a small battery-powered hygrometer clipped right inside the canopy, not just ambient air. Ambient can read 52% while inside those tight colas you're sitting at 65%. That gap is where mold lives. If I see a stretch of forecasted rain for more than two days, I throw a temporary greenhouse cover over the plants, just a simple hoop and poly setup. Not a permanent structure, just enough to keep direct moisture off the buds while still getting airflow on the sides. Airflow matters more than most people think. Still air is a death sentence in late September out here. Harvest a week early before a rain event rather than a week late after one. i've lost full plants waiting for that last bit of maturity. Not worth it.

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Seedling11d ago

I actually saved a The Seed Pharm Zkittlez run a couple years ago by harvesting about a week early when we had a long stretch of rain coming. Slightly early was way better than losing the whole thing.