Bok choy is a cool-season annual vegetable that is a popular cooking salad green and its production is increasing in the state. A number of local grocery chains carry the product in Iowa. Based on feedback from growers in the state, this study evaluated the performance of nine bok choy cultivars under high tunnel production. Cultivars evaluated included Black Summer, Feng Qing, Joy Choi, Mei Qing, Red Choi, Shiro, Toy Choy, White Flash, and Win-win Choi (Figure 1).