I always dry my seeds for 3 days minimum. I store in plastic baggies in the fridge and rarely have any mold. One summer I had a huge amount of crosses take and my crisper was so full that I could barely get it closed. That caused about 10 packages to mold. I think the fact that I had so many in the crisper caused the molding and there was not enough air circulation in there. I have also noticed that certain cultivar's seeds require more drying time than others. When I had Roses in Snow, I would have to dry the seeds from that one a few days longer or the seeds would always mold. Another cultivar's seeds that will mold if they are not dried longer is Pastel Classic.
