Dense CBD flowers in a damp autumn are a recipe for botrytis, and plenty of popular strains were bred indoors with no thought for outdoor conditions. Look for lines with looser bud structure and an early finish if you grow anywhere with wet Septembers. Growers in the Pacific Northwest and northern Europe have been sharing which CBD varieties held up and which rotted on https://calmcbdseeds.com, which is more useful than any breeder description. Airflow and spacing help but genetics decide most of it.