Mammoth Red Rock Cabbage (Heirloom, 95 Days)
Heirloom 1906. According to F.B. Mills 1936 catalog: The Mammoth Red rock Cabbage is “The largest of the Red Cabbages and the most sure heading, also the best for pickling”. Those good storing cabbages produce 5-8 pound flattened round heads. The color of the leaves is a reddish purple on the outside and right to the core.
Germination: 7-12 days
Germination Temperature: Optimum soil temperatures 65-85ºF.
Seed Sowing Depth: 1/4” deep
Starting Indoors: 4-6 weeks before last frost or 4-6. Sow 2-3 seeds per cell/pot. Fertilize the seedlings every 7-10 days with a liquid or water soluble fertilizer, diluted to ¼ of suggested measurement. Transplant a week or two before last frost. Sow in late spring to transplant out for fall crops.
Sowing Outdoors: In spring when soil temperature reaches at least 60ºF. Sow 2-3 seeds every 15-18” apart for small headed varieties, 24-36” for large headed varieties. Thin to the strongest seedling per space. Sow in early summer for fall crops. Germination is slower at lower soil temperatures.
How much does a packet plant: 15-20 foot single row
Harvest: If the heads feel solid by pushing on them lightly they are ready to harvest. Harvest as soon as possible for early varieties to prevent splitting. Later maturing storage varieties will hold longer.
Tips: A heavy feeder. The Mammoth Red Rock Cabbage needs to grow in fertile soil, rich in organic matter. Amend with compost if soil is not fertile. Provide adequate, even moisture for the optimum growth. Mulching helps retain moisture.