No frost the coldest it went was around 35 degrees, but I am in Maine so it’s possible it got cold at times. The only factors I can think of would be an extremely violent wind and rain storm, being rough with them at harvest because I was in a rush, my hygrometer being bad which led to a night of 35-40% humidity the first night drying, and and I gave them a heavy feeding of tiger bloom before being forced to pull early with no flush. I pulled half of the tops off this particular plant the rest of the tops are still going with zero sign of botrytis. Did not notice any botrytis while harvesting everything looked good.