I'm in Mississippi, and occasionally we see temps below freezing, but this year it has been colder than I remember it in a long time. We've already had snow, which happens only once every few years, and we are supposed to have some more this week. We are having lows in the low teens with highs not getting out of the 20s. This is highly unusual for this area, and I'm losing a lot of plants in my greenhouse because of it. My little space heater that has always been good enough for our weather is not cutting it with these super low temps.
I have NEVER worried about my sars during the winter. This is where they grow naturally, after all! But I got a lot of new plants this year, and a lot of them came from California and they are not used to these kinds of temps. I'm wondering if I should move everything into a greenhouse, or maybe at least put a plastic Wal-Mart bag over each pot to protect them from the wind until things warm up a little more.