70 Days to maturity. Brassica oleracea ’Brunswick’. Organic Brunswick Cabbage Seeds. Non-GMO, cool weather annual. Introduced in 1824 to the United States from Germany, this cabbage is excellent for making sauerkraut, a traditional German pickled condiment. Brunswick is a large drumhead-type cabbage. This cold hardy cabbage is ideal for fall/winter growing and stays good in storage for quite a while. ~6,800 seeds/oz.