(100 Days) The common commercial sprout until hybrids dominated the market. Firm heads, heavy set (50-100 per plant), ready over an extended period. Heirloom introduced in the 1890s. Sow seeds indoors 6-8 weeks before last frost. Plant 1„4″ deep. Seeds germinate in 5-10 days. Transplant outdoors 24″ apart before the last frost. Slow-growing, long-season vegetable that requires a regular water and full sun. The sprouts are most delicious after a frost or two.