Superschmelz Giant White Kohlrabi Seeds. 70 Days. Brassica oleracea. Non-GMO, Open Pollinated. Vegetable garden and microgreens seeds. A giant kohlrabi variety that retains its sweetness and tenderness at large size. The superschmelz produces huge bulbs that get as big as 10 inches in diameter. Translated from German kohl meaning cabbage and rabi meaning turnip, the kohlrabi plant is a unique and prolific winter hardy heirloom crop. Approximately 8,000 seeds/ounce.