40-50 Days to maturity. Brassica juncea. Yanagawa Takana Mustard Seeds. Non-GMO, heirloom. Yanagawa Takana Mustard is a semi-heading variety. It has large, loosely bunched, large green leaves and medium ribbed stems. This is a milder variety of mustard, slightly spicy but not as spicy or bitter as many other varieties. This mustard is a cool-weather crop, best grown in early spring or in fall. It will bolt in the high heat of summer but is easy to grow and quick to mature. It's a great addition to any garden. Approx 11,500 seeds / oz.