Mammoth Rock Heirloom Cabbage is a nice deep red, purple cabbage. It's one of the biggest and hardest of the red Heirlooms. It can grow from zones 2 to 10, and can over winter in zone 6b and above. It takes about 100 days to mature. It will store good as well. If you want full-proof red cabbage, definitely try this variety! Try transplanting these cabbages; they transplant very easily. The heads are 6 to 10 inches across and very firm. To our farmers market friends, pile up your tables from spring to fall with this Heirloom cabbage seed. You can only get great Heirlooms like this when you buy cabbage seed online. Happy growing!!!