Cabbage Seeds - Pak Choi - Da Hong Summer - Hybrid. Non-GMO. Brassica rapa Chinensis Group. 10-15 days microgreens; 20-30 days baby leaf; 45 days full maturity. Cool season annual. Da Hong Summer is slightly denser than other purple pak choi, former a more developed head, and firmer petioles. Leaf color is Dark violet-red with green petiole color It's heat tolerance is higher than many other pak choi, and it can also weather greater temperature fluctuations between day and night without bolting. ~ 9,500 seeds per oz.