72% Germination - Non-refundable clearance seeds. 60 Days to maturity. Organic Purple Vienna Kohlrabi Seeds. Non-GMO, Heirloom Purple Vienna seeds produce kohlrabi with purple bulbs and a light green interior. The flavor is mild, resembling the taste of a turnip. This unusual looking vegetable comes from northern Europe, and did not become common in the United States until after the civil war. Approx. 2,250 seeds/oz. Click here to view regularly priced, high germination seed.