Brassica oleracea, Botrytis Group. Broccoli is a rich source of vitamins C, K, and B-complex, along with a treasure trove of minerals. Although one cup of milk has more calcium than a cup of broccoli, the human body absorbs the calcium from broccoli more effectively than from milk. From your body's perspective, broccoli is said to be richer in calcium than milk! Days to maturity are calculated from date of transplanting; add 25-35 days if direct seeding.