45 Days to maturity. 20-30 Days for baby leaf. 10-15 Days for microgreens. Brassica rapa Chinensis group. Red Kingdom Pak Choi Seeds. Annual, Hybrid. Cool Season. This fast maturing pak choi hybrid has deep, dark purple top leaves, green on the underside, and deep purple veining. The leaves are unique because of their lobe shape. ~ 9,750 seeds per oz.