winter greens

Yesterday I picked some Lettuce from the coldframes outside- a bit of romaine and a handful of simpson. It's not nearly as tasty as when it grows in spring/fall, but surviving the snow regardless. Works fine as an addition to tacos and other dishes.
The Chard didn't fare as well, though. All dead. I think perhaps because that coldframe is stacked with boards and doesn't insulate as well as the lettuce ones, made with bricks? Maybe next year I can get a proper built coldframe or row cover to do a better job.