Mammoth Red Rock is a Brassica oleracea heirloom from 1906 with flattened round 5-8 pound heads, reddish purple outside into the core. Sow 1/4 inch deep, 24-36 inches apart for large heads, with sprouts in 7-12 days.
Sow outdoors when soil reaches at least 60°F, or indoors 4-6 weeks before last frost for spring and fall crops. Harvest when heads feel solid.
Features
Heirloom late cabbage
Good storing type
Best for pickling
For winter sowing
Direct sow type
Coverage: Plants 15-20 foot single row
Seed count: 100 seeds
Soil needs: Fertile soil rich in organic matter
Indoor starting: Sow 2-3 seeds per pot, fertilize at quarter strength
Days to maturity: 95 days
Germination temperature: 65-85°F optimum soil temperature
