180-220 days. Famous in England for one of the longest harvest periods of any winter cabbage. This slightly savoyed green cabbage produces 2-3 pound heads and has the ability to withstand temperatures down to 10°F for short periods. Magnificent for outdoor culture here in the Northwest and worth a try for cold frame production, especially in the far north! When sown in June and July, Tundra can be harvested from October right through to April.