When to Plant Kohlrabi in Florida (2026 Guide)
Kohlrabi is an intriguing vegetable that thrives in Florida's unique climate, making it a great addition to your garden. With its ability to withstand moderate frost, this unusual brassica can be planted in both spring and fall. Depending on where you are in Florida, knowing the local frost dates, such as the median last spring frost of January 30 in many cities, can greatly influence your planting schedule.
Kohlrabi flourishes in areas where conditions mimic those preferred by related brassicas like broccoli and cabbage. For gardeners in the colder regions of Florida, such as those experiencing a median last spring frost of March 4, timing your outdoor activities is crucial. The 266-day frost-free season allows for a more forgiving timeline to plant kohlrabi, ensuring ample time for growth before the heat of summer kicks in.
In Florida, kohlrabi can be enjoyed both raw and cooked, generally taking between 45 to 60 days from transplanting to harvest. Choosing the right time to start seeds indoors or transplant outdoors is essential, particularly in coastal areas like Cape Coral, where temperatures fluctuate. This comprehensive guide will equip you with all the knowledge you need to successfully grow kohlrabi in the Sunshine State, ensuring a bountiful harvest.
Planting Schedule by USDA Zone in Florida
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 8b–9a | Start February 15 – March 1, ~6–8 weeks before January 30 | Transplant outdoors March 15 – March 30, after frost risk passes | Direct sow March 1 – March 30, when soil temperature warms | Harvest May 30 – June 15, aiming for 3-inch bulbs |
| Zone 7b–8a | Start indoor from January 17 – February 5, ~6–8 weeks before March 4 | Transplant outdoors March 15 – April 1, avoiding late frost | Direct sow February 20 – March 10, when soil is workable | Harvest from June 1 – June 20, with bulbs reaching optimal size |
| Zone 9b | Start indoors December 10 – December 30, ~6–8 weeks before January 4 | Transplant outdoors January 15 – January 25, before the first fall frost | Direct sow December 20 – January 1, when soil is warm enough | Harvest February 25 – March 10, targeting the ideal bulb size |
Kohlrabi Planting Windows in Florida
- Indoor start: For optimal growth, start kohlrabi seeds indoors between December 10 and February 5 depending on your frost zone.
- Transplant outdoors: Transplant your kohlrabi seedlings outside from January 15 to April 1, adapting to your specific location's frost risk.
- Harvest: Kohlrabi can be harvested approximately 45 to 60 days after transplant, typically between May 30 and June 20.
Common Mistakes Growing Kohlrabi in Florida
- Planting kohlrabi too late can result in reduced bulb size and increased bitterness in flavors. In Florida, aim to transplant by the designated dates to avoid the heat of summer.
- Neglecting soil quality can lead to poor growth. Florida's heavy clay and sandy soils may require amendment with compost for better drainage and nutrients.
- Assuming kohlrabi is only a spring crop may limit your harvests. In Florida, utilizing the frost-free season effectively allows for both spring and fall planting.
- Ignoring the humidity levels of Florida can lead to fungal problems. Keeping kohlrabi well-spaced and ensuring airflow can mitigate these issues.
- Overwatering or allowing standing water can cause root rot. Especially in Florida's wet season, it's essential to monitor soil moisture to ensure healthy growth.
Frequently Asked Questions
What if I'm in a cold pocket of Florida?
If you find yourself in a colder pocket, monitor local frost dates closely and consider planting hardier varieties of kohlrabi. You may also extend growing seasons with row covers.
Can I still plant kohlrabi in May?
While it can be tempting to plant kohlrabi later in the season, aim for early spring planting to ensure successful growth and avoid heat-induced bitterness.
What pests should I watch out for when growing kohlrabi?
Common pests such as aphids and cabbage worms may affect your kohlrabi. Regular monitoring and using organic pest control measures can help protect your crops.
How deep should I plant kohlrabi seeds?
Kohlrabi seeds should be planted about half an inch deep. Proper planting depth helps with germination and can prevent them from being washed away during watering.
Are there any diseases specific to kohlrabi in Florida?
Kohlrabi can be susceptible to diseases like downy mildew and black rot, especially in the humid climate of Florida. Proper spacing and watering practices are crucial for preventing these issues.