Seed Savers Exchange Cabbage, Mammoth Red
Introduced in 1889. Solid uniformly round heads are 8" in diameter and weigh 7 pounds. A sure cropper with a small to medium core that is red throughout; fine flavor, excellent for cooking, salads, and pickling. 98 days from transplant.
You should start plants indoors 4-6 weeks before the last frost date for transplanting them into the garden.
Make sure that your soil is well fertilized as this crop is a heavy feeder and takes a lot of nutrients from the soil. Consider adding compost to the soil the year before you plant.