45 days to Maturity, 20-30 days as baby Pak Choy. Brassica rapa var. chinensis. Purple Vita Pak Choi Seeds. Annual, Hybrid. This is a cool season pak choi produces beautiful colors in both cool and warm temperatures. The leaves are a deep purple with a green underleaf and petioles. The leaves are round and uniform. Purple Vita is a tender, mild-flavored variety that can be harvested at any stage- microgreens, baby leaf, or at full maturity. ~ 10,600 seeds per oz.