30-35 days to maturity.Brassica rapa var chinensis. Hotau Hybrid Pak Choi Chinese Cabbage Seeds. Non-GMO, warm or cool-season annual, hybrid. Mini type pak choi, 8-10cm (3-4 inches), uniform, wide and fat petioles. Fast-growing, slow bolting, and heat-tolerant. Can be planted in late spring, summer, and fall. Perfect for a quick crop of delicious greens! ~ 9,500 seeds per oz.