If I'd put up simple hoop houses last fall, maybe I'd have more to harvest after all the exceptionally cold weather. Or maybe not. My flats of greens (in the open) look fine, and have sailed through quite a bit of pummeling, but they don't look robust or large enough to harvest, as of yet.Vegetables in a Vietnamese marketEven in the sheltered kitchen garden (near my office, at the botanical garden where I work), to be honest, the cold and damp (sometimes icy) weather doesn't much encourage me to go out and cut bunches of kale, argula, cilantro, or poke around for turnips, even though they…