1 packet contains Pak Choy - 100 seeds. A cool-season vegetable in the cabbage family, pak choy (Brassica rapa var. chinensis) features a mild flavor perfect for stir fries. Pak choy grows in Sunset?s Climate Zones A1 through 3b and 4 through 24. Pak choy prefers growing in mild temperatures between 60 and 70 degrees. Lifecycle: annual Timing: Spring crops require good timing and careful pest control. Direct-seeded fall crops are easier to grow. Shape: cushion, mound or clump.