8-12 Days to microgreen harvest. Raphanus Raphanistrum Sativus. Green Stem Radish Seeds. Annual, Non-GMO, Open Pollinated, Heirloom. These Green Stem Radishes are specifically intended to be used for sprouting and microgreens. Very popular in Japan. The seedlings have very light green stems and green leaves. They are quick-growing, crisp, tender, and have a nice flavor and pungency. Maturity is 8 to 12 days for microgreens. Non-GMO, Open Pollinated, Heirloom. ~ 3,000 seeds / oz.