How to Grow Kohlrabi

Start Kohlrabi seeds indoors 4 weeks before your last frost date, then transplant outdoors -2 weeks after the last frost. Use the search on this page to find exact dates for your ZIP code or city.

Kohlrabi typically matures in about 55 days from planting. Exact timing varies by variety, soil conditions, and local climate.

Kohlrabi should be started indoors 4 weeks before the last frost date. This gives seedlings time to establish before being transplanted outside after frost danger has passed.

Kohlrabi requires full sun to partial shade to thrive.

Space Kohlrabi plants 6 inches apart to allow adequate airflow and root development.

Kohlrabi has regular (consistent moisture prevents cracking) water needs. Consistent moisture is important especially during germination and early growth.

Yes — seed saving difficulty for Kohlrabi is rated difficult. Allow plants to bolt in year 2. Harvest seed pods just before they shatter. Thresh dried seed stalks in a bag, separate seeds from chaff by winnowing.

Properly dried and stored Kohlrabi seeds remain viable for up to 4 years. Store in a cool, dark, dry location in an airtight container with a silica gel packet for best results.

Yes — Kohlrabi is open-pollinated, meaning seeds saved from your harvest will grow plants true to the parent variety. This makes it an excellent candidate for building a self-sustaining garden.