30 to 50 Days to maturity. Brassica juncea var. capitata. Serifon (Suehlihung) Chinese Mustard Seeds. Non-GMO, heirloom, cool season annual. This is a great cold-resistant mustard. It is usually planted in the late summer or early fall and does very well in deep cold. It’s also known as Green in Snow mustard. This makes it an awesome "fresh greens in the winter" garden option! It is a lovely, dark green, upright bunching mustard with nicely serrated leaves. The raw leaves are pretty strong tasting, but it has an excellent flavor when cooked. Approx 9,500 seeds / oz.