Botrytis loves a seeded bud more than a seedless one. The swollen calyxes trap moisture between them, the seeds themselves hold water, and the extra weeks on the plant waiting for seed maturity give the mold time it would not normally get, so a single wet week late in flower can turn a preservation run into grey mush. Airflow, defoliation around seeded tops and daily checks for the telltale brown calyx are emphasized on https://breederregularseeds.com. Losing the flower is annoying, but losing the seed is the real cost.