Spinach, carrots, and radicchio along with numerous other crops were planted in August specifically for winter growing under glass. The plants grew as planned to maturity until the first official freeze about 6 weeks ago. About three weeks ago, I checked on things and thought for sure it was all gone. It was wilted and lying over. I mumbled to hubby that was a failed experiment. Last week, I thought I'd dig up some carrots to see what was there. Low and behold I harvested carrots. And today, I picked a beautiful batch of spinach and the last two heads of radicchio (small, but edible). I was thrilled to say the least. Root crops seem to fair the best, so that's the thought for next year... carrots, beets, turnips, and possibly a couple potatoes or sweet potatoes. It's obvious plants will "appear" dead in sub-freezing temps, but the varieties hardy to winter freezing like spinach and chard will bounce back. This is an interesting experiment I'm sure to attempt again next year.