50 to 60 Days to maturity. Raphanus sativus. Tokinashi All Season Heirloom Radish Seeds. Cool Season Annual. Tokinashi All Season radishes are very popular in Japan and other Asian regions for their flavor and versatility. As its name implies, this variety can be grown year-round in some climates! They are slow to bolt so they can handle some heat. The roots will grow 10 to 16 inches long and 2 inches in diameter with a point like a carrot. Tokinashi radishes will always turn out high-quality, tasty, and beautifully white. ~ 3,800 seeds / oz.