Comes with 30 seeds. You may plant Brunswick cabbage in winter or spring, as well as fall. Much of your planting decision depends on your location. This large head cabbage needs soil temperatures of 45 degrees F. (7 C.). If air temperatures are lower than this but above freezing for most hours, there are alternatives to keep the soil warm. A layer of mulch or of plastic, or both, keeps the soil warmer for the roots. This can be valuable in colder winter climates. Heads of Brunswick cabbage continue growing unless temperatures reach freezing and remain. This specimen takes 90 days to reach maturity, so calculate accordingly in your area. Cold and frost give the Brunswick heads a sweeter flavor. You may start Brunswick cabbage from seed to hasten your late winter planting. Sprout seeds indoors and begin gradually acclimating them to the outdoor cold six weeks before your average last freezing date. Grow seeds to 2 inches (5 cm.) with a few sets of leaves before planting into the ground.

Read more at Gardening Know How: Brunswick Cabbage Variety – How To Grow Brunswick Cabbage Plants