When to Plant Kohlrabi in Tennessee (2026 Guide)
Kohlrabi is an intriguing vegetable that many gardeners overlook. In Tennessee, its adaptability makes it an excellent choice for both spring and fall planting. With the last spring frost in places like Nashville on April 13, you can time your planting for optimal growth and flavor.
This unique brassica produces a swollen stem that is crisp and juicy, providing a milder and sweeter taste reminiscent of broccoli. As it matures in just 45-60 days, it’s an excellent crop to fill the gaps in your garden, especially between slower-growing plants like tomatoes or peppers.
Whether you’re in Knoxville or Memphis, understanding when to plant kohlrabi is key to maximizing your harvest. It thrives in the cooler months, making it a fantastic addition to your fall garden before the first frost on October 22 in Zone 6b, ensuring you enjoy this nutritious vegetable throughout the growing season.
Planting Schedule by USDA Zone in Tennessee
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6b | Start March 1 – March 15, ~6 weeks before April 13 | Transplant outdoors April 15 – April 30, after last frost | Direct sow April 1 – April 15, after last frost | Harvest June 1 – June 15, when bulbs are about 3 inches |
| Zone 7a | Start February 15 – March 1, ~6 weeks before March 27 | Transplant outdoors March 30 – April 15, after last frost | Direct sow March 15 – April 1, after last frost | Harvest May 20 – June 5, when bulbs are about 3 inches |
| Zone 6a | Start February 15 – March 1, ~6 weeks before April 18 | Transplant outdoors April 20 – May 5, after last frost | Direct sow April 5 – April 20, after last frost | Harvest June 5 – June 20, when bulbs are about 3 inches |
Kohlrabi Planting Windows in Tennessee
- Indoor start: Start your kohlrabi seeds indoors from February 15 to March 1 for the best transplanting timing.
- Transplant outdoors: Transplant kohlrabi seedlings outdoors around April 15 to April 30 to avoid frost damage.
- Harvest: Expect to start harvesting your kohlrabi from June 1 to June 15, when the bulbs reach about 3 inches in diameter.
Common Mistakes Growing Kohlrabi in Tennessee
- Many gardeners in Tennessee overlook late spring frosts. By not monitoring the weather closely, you risk losing your kohlrabi seedlings. Always check local forecasts and be prepared to protect them if necessary.
- Planting too late is a common mistake for Tennessee gardeners. With a frost-free growing season varying based on the region, ensure you start your kohlrabi early enough to avoid the summer heat and guarantee timely growth.
- Not considering humidity can be detrimental for kohlrabi. Higher humidity levels in Tennessee can lead to disease, especially if air circulation is poor. Take care to space plants appropriately and monitor for any signs of mold.
- Some gardeners mistakenly believe kohlrabi only thrives in cooler zones. However, it's adaptable. In more moderate areas of Tennessee, with the right timing, you can successfully grow this vegetable even in warmer summers.
- Ignoring soil conditions can hinder your kohlrabi growth. Tennessee's clay and sometimes alkaline soils may require amendments to support healthy root development. Regular soil testing and using compost can optimize growth.
Frequently Asked Questions
What if I'm in a cold pocket of Tennessee?
If you're in a colder area, be cautious of late frosts. Start your seeds indoors sooner or protect them with row covers when transplanting outdoors to ensure they make it through unexpected chilly nights.
Can I still plant kohlrabi in May?
While you can plant kohlrabi in May in warmer areas of Tennessee, it’s crucial to choose varieties that can tolerate heat and ensure they are well-watered, as they may struggle with high temperatures and quick maturity.
How deep should I sow kohlrabi seeds?
Sow kohlrabi seeds about ½ inch deep. Ensure they are spaced properly to allow for growth, and use fine soil to cover the seeds for optimal germination.
How often should I water kohlrabi?
Kohlrabi prefers consistent moisture, so water it regularly, especially during dry spells. Aim for about 1 inch of water per week to keep the soil moist but not waterlogged, as soggy roots can cause rot.
What should I do with leftover kohlrabi greens?
Kohlrabi greens are nutritious and delicious. Use them in salads or cook them similarly to kale by sautéing with garlic or adding them to soups and stir-fries for added flavor and nutrition.
Keep Learning
City guides in Tennessee
Other crops in Tennessee
Typical fall sowing window for Kohlrabi in Tennessee: August 14 – September 4.