Shogoin Turnip Seed : ( 70 Days ) Heirloom This Japanese turnip is grown for both its mild green tops and fine grained roots. The greens grow to 20" in height, while the tender white roots swell into a globe shape up to 4" in diameter. The tops are tender and can be used as greens. Roots are best when harvested young. Great for pickling or cooking in soups or stir-fries.