Several years ago we used some old windows to build two coldframes. When we moved, they moved with us, but just sat in the side yard looking forlorn for almost a year. This fall I put one of them to work again. I planted lettuce and spinach and plan to plant lettuce and spinach in the other one too so we will have a "continuous" harvest. The picture above is with the top open, but when it is closed the whole "roof" is window that allows it to work as a greenhouse. When I keep it closed the sun warms it and it holds it heat in the night. In other beds I also have beets and cilantro. Every few days I can harvest just enough greens for two salads for dinner.
As we are planning our garden for next year I am trying not to dwell on my past failures (of which there are many), but to celebrate my successes. Salad in December is definitely a success! And I have to say it is the BEST salad I've had in ages and ages.