30-40 days to maturity.Brassica rapa var chinensis. Hotau Improved Hybrid Pak Choi Chinese Cabbage Seeds. Non-GMO, warm or cool-season annual, hybrid. This is a mini-type pak choi that is commonly seen in stores. The plants uniformly grow 3-4 inches tall and wide and have big petioles; they are fast-growing, very slow bolting, and heat tolerant. These can be planted in late spring, summer, and fall. They are a recommended variety for minim pak choi production. ~ 6,000 seeds per oz.