30-35 Days to maturity. Brassica rapa Chinensis group. Wa Wa Qing, Pak Choi (Bok Choy) Seeds. Hybrid Non-GMO Annual. This is a “Shanghai baby” pak choi variety. Plants grow upright, short (6-8" tall) and compact. Leaves are dark green with green petioles that are wide and thick. Heat tolerant and slow bolting. For late spring, summer and fall planting. Recommended variety for mini pak choi, Shanghai Miao, and small size Shanghai pak choi. ~ 11,000 seeds per oz.