I'm doing some research on growing greens this winter and on having a cold frame. I have to admit this is a very different blog post for me... it's really more of a place holder for what I'm learning.
Here's a video that I've really enjoyed:
Cold Frame and Green House covering... this Solexx stuff sounds really neat!
Greens for Winter Harvest
The following greens are winter hardy:
Arugula, Kale, Chard, Spinach, Beet Greens, Collards, Mustard, Pac Choi, Mizun, Tatsoi
Here's a good article that I found on Greens for the winter!