How to Grow Kohlrabi at Home

Introduction

Kohlrabi, often referred to as the “turnip cabbage,” is a unique and versatile vegetable belonging to the Brassica family, which includes broccoli, kale, and cabbage. Renowned for its crisp texture and mildly sweet flavor, kohlrabi is not just a culinary delight but also an easy-to-grow crop that can thrive in home gardens. This article will provide comprehensive insights into growing kohlrabi, exploring its history, cultivation techniques, and storage methods, making it an essential guide for both beginner and seasoned gardeners.

What Is Growing?

Growing refers to the process of cultivating plants, involving several stages from seed germination to maturity. In the case of kohlrabi, this includes understanding the plant’s requirements—such as soil type, water, light, and temperature—alongside the best practices for sowing, maintaining, and harvesting the crop. This holistic approach ensures a successful yield, allowing gardeners to enjoy fresh kohlrabi straight from their gardens.

History and Origins

Kohlrabi traces its roots back to Europe, where it has been cultivated since the Middle Ages. The name is derived from the German words “kohl” (cabbage) and “rübe” (turnip), reflecting its hybrid nature. Its cultivation spread throughout Europe and eventually made its way to Asia and the Americas. The vegetable gained popularity due to its adaptability to different climates and its nutritional benefits. Today, kohlrabi is cultivated worldwide, with various cultivars available, each exhibiting unique characteristics in terms of color, size, and flavor.

Production and Processing

Soil Preparation

Kohlrabi thrives in well-draining, fertile soil with a pH of 6.0 to 7.0. Prior to planting, it’s vital to enrich the soil with organic matter, such as compost or well-rotted manure, to enhance fertility and moisture retention. A soil test can help determine nutrient levels and inform any necessary amendments.

Sowing

Kohlrabi can be sown directly in the garden or started indoors. If starting indoors, sow seeds in biodegradable pots about 6–8 weeks before the last expected frost. Transplant them outdoors when the seedlings have at least two true leaves and the risk of frost has passed. For direct sowing, plant seeds about ½ inch deep and 2–4 inches apart in rows spaced 12–18 inches apart. Optimal planting times vary by region but generally occur in early spring or late summer.

Watering and Fertilization

Kohlrabi requires consistent moisture, particularly during the initial growth stages. Aim for about 1–2 inches of water per week, either through rainfall or supplemental irrigation. Overhead watering is effective, but soaker hoses can help minimize water on the foliage, reducing disease risk.

Fertilization should occur approximately four weeks after sowing, using a balanced fertilizer (like a 10-10-10 NPK) or organic alternatives. Follow the manufacturer’s instructions for application rates to avoid nutrient burn.

Pest and Disease Management

Kohlrabi is generally resilient but can be susceptible to pests such as aphids, cabbage worms, and flea beetles. Implementing row covers can help protect young plants. Regular monitoring and natural pest control methods—such as introducing beneficial insects—can also support healthy growth.

Common diseases affecting kohlrabi include downy mildew and black rot. To prevent these issues, practice crop rotation, ensure adequate spacing for air circulation, and avoid overhead watering.

Quality and Grading

The quality of kohlrabi is influenced by its size, color, and texture. High-quality kohlrabi should be firm, with smooth skin and vibrant color. The bulb should be harvested when it reaches 3–4 inches in diameter for optimal flavor and tenderness, as larger bulbs can become woody and tough.

Grading typically occurs during harvest, with higher grades reserved for uniform, blemish-free specimens. Consistent size and a lack of cracks or disease symptoms are key indicators of superior quality.

Buying Considerations

When purchasing kohlrabi seeds or seedlings, consider the variety that best suits your climate and growing conditions. Popular varieties include ‘Purple Vienna’ and ‘White Vienna,’ each offering unique flavors and textures. Look for reputable suppliers that provide organic options and check for seed viability dates to ensure freshness.

If buying kohlrabi from a store or farmer’s market, select bulbs that are free from blemishes and feel heavy for their size. Avoid any with soft spots or signs of decay.

Uses and Applications

Kohlrabi is incredibly versatile in the kitchen. It can be consumed raw, steamed, roasted, or sautéed, making it an excellent addition to salads, stir-fries, and soups. The leaves are also edible, often used in salads or sautéed similarly to collard greens.

Its mild flavor allows kohlrabi to absorb seasonings well, making it suitable for various cuisines. Additionally, kohlrabi can be pickled, providing a tangy crunch to dishes.

Storage and Shelf Life

Kohlrabi can be stored for several weeks if kept in a cool, dark, and humid environment. Ideally, it should be placed in the vegetable crisper drawer of the refrigerator. If left unwashed, it can last up to three weeks. For longer storage, kohlrabi can be blanched and frozen, retaining its flavor and texture for several months.

To maximize shelf life, remove the leaves before storage, as they can draw moisture from the bulb. Store the leaves separately in a damp paper towel within a plastic bag to maintain freshness for a few days.

Common Misconceptions

One common misconception about kohlrabi is that it is a root vegetable. In reality, kohlrabi is a swollen stem that grows above the ground, which is why it has a bulbous appearance. Another myth is that kohlrabi is difficult to grow; in truth, it is a hardy plant that thrives with proper care and attention.

Additionally, some people may believe that kohlrabi is only available in one color. However, it comes in various shades, including green, purple, and white, each offering slight variations in flavor and texture.

Frequently Asked Questions

1. When is the best time to plant kohlrabi?

Kohlrabi is best planted in early spring or late summer, depending on your climate. It prefers cooler temperatures and can tolerate light frosts.

2. How much space does kohlrabi need in the garden?

Kohlrabi plants should be spaced about 12–18 inches apart in rows, allowing ample room for growth and air circulation.

3. Can kohlrabi be grown in containers?

Yes, kohlrabi can be successfully grown in containers. Choose a pot that is at least 12 inches deep and wide, and ensure it has good drainage.

4. What is the ideal temperature for growing kohlrabi?

Kohlrabi thrives in temperatures between 60°F and 75°F (15°C to 24°C). High temperatures can cause stress and lead to bolting.

5. How can I tell when kohlrabi is ready to harvest?

Kohlrabi is ready to harvest when the bulbs reach 3–4 inches in diameter. They should feel firm and have smooth skin.

6. Are kohlrabi leaves edible?

Yes, the leaves of kohlrabi are edible and can be used in salads or cooked dishes, similar to other leafy greens.

Conclusion

Growing kohlrabi at home is a rewarding endeavor that not only adds diversity to your garden but also enriches your culinary repertoire. By understanding the plant’s requirements and following best practices in cultivation, you can enjoy fresh kohlrabi year-round. Whether you’re a novice gardener or an experienced horticulturist, kohlrabi’s unique flavor and versatility make it a worthwhile addition to any home garden.