It's the cold weather and the starin you're using. The little chrystals are probably just the little hairs that are naturally there. And if its outdoor, It is NOT flowering. just let nature take its course and they will be fine. If it gets below 20 you definatley need to bring it in. Temperatures below 55 stunt growth and below freezing is insane. If you can bring them in at night or just leave them in a window seal. Those Snow-flakly chrystals could be frost and that will kill your plant.