Chinese Cabbage Seeds - Hiroshimana. Heirloom, Non-GMO. Brassica rapa var pekinensis. Cool season annual. 45 days. This loose-leaf Chinese cabbage variety has medium green, glossy leaves and pale green midribs. In frost-free areas, it can be sown all year long but avoid planting in the middle of a hot summer. For larger heads, harvest in 60-70 days. Stir-fry or steam. Chinese and Japanese cooks often use loose-headed cabbages for pickling. Chinese cabbage prefers cool temperatures for its main growing season. ~ 4,480 seeds per oz.