Kohlrabi is grown as a cool season vegetable and should be planted in very early spring or in early fall. Ample soil moisture and high soil fertility are necessary for rapid growth of quality kohlrabi. Kohlrabi is ready to harvest 30 to 40 days from the date seed is sown. Look for fresh kohlrabi bulbs that are less than 3 inches in diameter. Leaf stems should be succulent and tender.
Large kohlrabi can be woody and tough.
With the leaf stems removed, kohlrabi can be stored in refrigeration for several weeks. Storage life can be extended if kohlrabies are placed in sealed plastic bags.