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Growing kohlrabi in September can be a rewarding experience for gardeners looking to enjoy fresh, crunchy vegetables late in the season. With proper planning and care, you can harvest healthy kohlrabi bulbs before the colder weather sets in.
Choosing the Right Varieties
Select kohlrabi varieties that mature quickly and are suitable for fall planting. Look for options labeled as early or quick-maturing, which typically take about 50 to 60 days from sowing to harvest. Popular varieties include ‘Purple Vienna,’ ‘White Vienna,’ and ‘Gigante.’
Preparing the Soil
Ensure the soil is well-drained, fertile, and rich in organic matter. Kohlrabi prefers a soil pH between 6.0 and 7.5. Before planting, amend the soil with compost or aged manure to provide essential nutrients and improve soil structure.
Soil Preparation Tips
- Test soil pH and adjust if necessary.
- Incorporate compost into the top 6 inches of soil.
- Ensure good drainage to prevent root rot.
Planting Kohlrabi in September
Start seeds indoors 4-6 weeks before the desired planting date or sow directly into the garden once the soil has cooled to around 60°F (15°C). Space seeds about 1 inch apart in rows 12-15 inches apart. Thin seedlings to 4-6 inches apart once they have established.
Direct Sowing Tips
- Plant seeds ½ inch deep.
- Water thoroughly after planting.
- Maintain consistent moisture for optimal growth.
Caring for Your Kohlrabi Plants
Regular watering is essential, especially during dry spells. Keep the soil consistently moist but not waterlogged. Mulching around plants can help retain soil moisture and suppress weeds.
Fertilizing
Feed plants with a balanced fertilizer every few weeks. An application of a high-phosphorus fertilizer can promote healthy bulb development. Avoid excessive nitrogen, which encourages leafy growth at the expense of bulbs.
Managing Pests and Diseases
Watch for common pests such as aphids, flea beetles, and cabbage worms. Use organic methods like neem oil or insecticidal soap to control infestations. Practice crop rotation and proper spacing to reduce disease risk.
Preventive Measures
- Remove plant debris to prevent pests.
- Use row covers to protect young plants.
- Ensure good air circulation around plants.
Harvesting Kohlrabi
Harvest kohlrabi when the bulbs reach about 2-3 inches in diameter for the best flavor and texture. Use a sharp knife to cut the bulbs from the plant, leaving a small stem attached. Regular harvesting encourages new growth and prevents the bulbs from becoming woody.
Timing and Tips
- Monitor plants closely as they near maturity.
- Harvest before the first frost to ensure quality.
- Store harvested kohlrabi in the refrigerator for up to a week.
With proper timing and care, growing kohlrabi in September can provide a delicious addition to your fall garden harvest. Enjoy the crisp, sweet flavor of freshly picked kohlrabi in salads, stir-fries, or as a snack.