45 Days to maturity. Brassica rapa var. chinensis. Purple Shanghai Hybrid Pak Choi Cabbage Seeds. Non-GMO, annual, open-pollinated, purple pak choi cabbage. Suitable for growing in fields, containers, garden plots, raised beds, and greenhouses. This delicious purple pak choi variety has spoon-shaped purple leaves with green petioles. They have an upright habit and can be grown as sprouts, microgreens, baby greens, or harvested at maturity. ~5,500 seeds/oz.