35 to 45 Days to maturity. Brassica juncea var. capitata. Small Gai Choi Mustard Seeds. Heirloom. Cool season annual. This heirloom Chinese mustard green is very vigorous and productive. It is a non-heading type of mustard, with large stalks and fan-shaped tender green leaves that are a bit wrinkled. It’s leaves are spicy, similar to good Wasabi mustard, making it a kay ingredient in many spicy Asian dishes. This variety is fairly heat-tolerant so it is a good summer plant for your garden. This may bolt in the spring or in cold weather. Approx 22,300 seeds / oz.