Radish Seeds - Nerima. Heirloom, Non-GMO. Raphanus sativus. 70 days. Cool season annual. This popular, large, long white daikon is a traditional variety that comes from Nerima-ku of Tokyo, Japan. It grows 15-17" long and has crisp, firm flesh. An easily grown autumn/winter maturing variety that grows best in deep, rich soils. ~ 3,800 seeds / oz.