Cabbage Seeds - Pak Choi - Chun Yu - Hybrid. Non-GMO. Annual. Brassica rapa Chinensis group. 40-50 days. Cool-warm season. This is a medium size shanghai pak choi hybrid with medium maturity. Compact and nice shape with dark green leaves and short petioles, Tolerance to heat and cold and very slow bolting. Suitable for spring, summer and fall planting. Can be planted for Shanghai Pak Choi and Shanghai Miao. ~ 6,000 seeds per oz.