40-50 Days to maturity. Brassica junceaRed Capital Mustard Seeds. Hybrid, Non-GMO. Annual. This little known variety is a fast-growing tasty mustard. Both the full-sized and baby greens are recognizably by their serrated broad leaves. The baby greens can be harvested after about 20 to 25 days. The baby leaves are an excellent choice if you are looking to add some attractive color to any recipe with tender mixed greens. Approx. 7,500 seeds / oz.