40 Days to maturity. Raphanus sativus. Red Arrow Radish Seeds. Non-GMO, annual, open-pollinated, heirloom, winter radish. While this variety was developed for its bright red stems at the microgreen stage, it can still be grown as a Japanese Daikon-type root radish with pink skin and a white core. Unlike other spicy varieties, Red Arrow is only mildly spicy. ~ 2,800 seeds/oz.