Heirloom Purple Vienna Kohlrabi Seeds. 55 days. Crisp, 2 to 3 inch bulbs have tender white flesh, and colorful purple skins This variety is also known as 'Early Purple Vienna' and 'Di Vienna Violettto' kohlrabi. "Kohlrabi" comes from the German kohl (cabbage) and the Swiss-German rabi (turnip) due to the combination of its appearance and flavor. It is a relatively recent addition to the cabbage family, with historical records only dating back to the end of the 16th century.