Spacing and Soil Preparation

Proper spacing and soil preparation are critical for growing robust kohlrabi bulbs. Kohlrabi prefers loose, well-drained soil with a pH between 6.0 and 7.5. Before planting, amend the soil with organic matter such as compost or well-rotted manure to improve fertility and drainage.

Spacing for Optimal Growth

Kohlrabi requires adequate space to develop its signature bulbs without crowding. When planting seeds or transplants, space them 6-8 inches apart in rows that are 12-18 inches apart. This spacing allows for proper air circulation, reduces the risk of disease, and ensures each plant has sufficient room to thrive.

Soil Preparation Tips

1. Loosen the Soil: Use a garden fork or tiller to loosen the top 12 inches of soil. This encourages healthy root development.
2. Incorporate Nutrients: Mix in 2-3 inches of compost or an organic vegetable fertilizer to provide essential nutrients.
3. Maintain Even Moisture: Kohlrabi is sensitive to inconsistent watering, so ensure the soil retains moisture without becoming waterlogged.

By preparing the soil properly and spacing your plants correctly, you’ll set the stage for healthy, vigorous kohlrabi growth.

Watering Schedule

Consistent watering is one of the most critical aspects of kohlrabi care. Proper hydration helps prevent stress on the plants, which can lead to woody or split bulbs.

How Much and How Often?

Kohlrabi requires about 1-1.5 inches of water per week, either from rainfall or supplemental irrigation. It’s essential to maintain even moisture throughout the growing season, especially during dry spells.

Tips for Effective Watering

1. Water Early in the Day: Watering in the morning reduces evaporation and allows leaves to dry before nightfall, minimizing disease risk.
2. Use Mulch: Apply a 2-3 inch layer of organic mulch around your kohlrabi plants to retain soil moisture and regulate temperature.
3. Avoid Overwatering: Excessive water can lead to root rot or split bulbs. Check the soil’s moisture level by inserting your finger a few inches into the ground—water only when the top inch feels dry.

By following a consistent watering schedule, you’ll encourage steady growth and prevent common water-related issues in your kohlrabi garden.

Seasonal Planting Tips

Timing is everything when it comes to growing kohlrabi. As a cool-season crop, it thrives in moderate temperatures and struggles in extreme heat or frost. Understanding when and how to plant is key to a successful harvest.

When to Plant Kohlrabi

1. Spring Planting: Sow kohlrabi seeds 4-6 weeks before the last frost date in your area. In cooler climates, transplants can be set out as soon as the soil is workable.
2. Fall Planting: For a fall crop, plant seeds 6-8 weeks before the first expected frost. Kohlrabi performs exceptionally well in the fall, as cooler temperatures enhance its flavor and texture.

Regional Considerations

• Cool Climates: Kohlrabi can be grown throughout spring and fall, with minimal risk of bolting.
• Warmer Climates: Focus on fall planting to avoid summer heat, which can stress plants and hinder bulb development.

For best results, choose fast-maturing varieties like ‘Early White Vienna’ or ‘Purple Vienna,’ which are well-suited for both spring and fall gardens.

Pest Prevention

Kohlrabi, like many cruciferous vegetables, can attract pests such as cabbage worms, aphids, and flea beetles. Taking proactive measures to prevent infestations will help protect your plants and ensure a bountiful harvest.

Common Pests and Solutions

1. Cabbage Worms: These green caterpillars chew holes in leaves and can damage young plants. Use floating row covers to block adult moths from laying eggs, and handpick worms when spotted.
2. Aphids: These tiny, sap-sucking insects can weaken plants and spread disease. Spray plants with a strong jet of water or apply insecticidal soap made from organic ingredients.
3. Flea Beetles: Small, shiny beetles that create pinholes in leaves. Protect young plants with row covers and sprinkle diatomaceous earth around the base of plants to deter beetles.

Organic Pest Control Methods

• Companion Planting: Grow kohlrabi alongside pest-repellent plants like marigolds, dill, or nasturtiums.
• Beneficial Insects: Encourage natural predators such as ladybugs and lacewings by planting a variety of flowers in your garden.
• Crop Rotation: Rotate kohlrabi with non-brassica crops each year to reduce pest buildup in the soil.

By incorporating these pest prevention strategies, you’ll maintain healthy kohlrabi plants without relying on synthetic chemicals.

Harvesting

Knowing when and how to harvest kohlrabi is the final step in enjoying this unique vegetable. Kohlrabi is best picked when the bulbs are tender and flavorful, ensuring maximum enjoyment from your homegrown crop.

When to Harvest Kohlrabi

Most kohlrabi varieties are ready for harvest 45-60 days after planting. Look for bulbs that are 2-3 inches in diameter, which is when they’re most tender. Allowing bulbs to grow larger can result in woody, tough flesh.

How to Harvest

1. Cut at the Base: Use a sharp knife or garden shears to cut the bulb from the plant at soil level.
2. Handle with Care: Avoid pulling on the plant, as this can disturb neighboring kohlrabi or damage the roots.
3. Harvest Continuously: If you stagger your planting, harvest plants as they mature to enjoy a steady supply throughout the season.

After harvesting, remove the leaves and store bulbs in the refrigerator for up to three weeks. Kohlrabi can be eaten raw in salads, roasted, or used in soups and stews.

In Summary

Growing kohlrabi can be a rewarding experience for gardeners of all skill levels. By focusing on proper spacing and soil preparation, maintaining a consistent watering schedule, planting during the right season, preventing pests organically, and harvesting at the optimal time, you can cultivate a thriving kohlrabi garden. Whether you’re growing kohlrabi bulbs for fresh salads, hearty stews, or simply to try something new, these best kohlrabi tips will guide you toward success.

With a little care and attention, your homegrown kohlrabi will become a standout feature in your vegetable garden—delicious, nutritious, and uniquely your own.