20-30 Days to Baby Leaf Maturity. Brassica juncea ’Japanese Giant Garnet’. Japanese Giant Garnet Mustard Seeds. Non-GMO, Open Pollinated, Annual. The solid, rounded leaves of this baby leaf variety are a uniform, deep purplish red color. Leaves produce their color early in the growing season and retain it through summer. With its mild but distinct flavor, Japanese Giant Garnet complements any collection of greens. The seeds come directly from Japan. This variety is most suitable for being cultivated as a baby leaf salad green. Approx 14,000 Seeds / Oz.