Radishes .. The frost has killed all of the buckwheat. All the buckwheat that was planted before September 15 managed to produce viable seed - it is good for a short season, but not frost tolerant the way chicory, radish and cabbages are. Although they are not in flower right now, there are several medicago sativa (alfalfa, for the normal folks) around that are taking advantage of the mild winter to put on some greenery. One established, an alfalfa plant can come back year after year, allowing you to 'prune' it for fertilizer and growth hormone for the rest of your garden for 4-8 years before needing to be replanted. Mints - all of them, even the ones that don't smell 'minty' - can be quickly identified by their square stems and leaves appearing in opposing pairs along the stem.