Purple kohlrabi, a member of the Brassica family, is a stunning and nutritious vegetable that adds a touch of elegance to any garden or plate. With its deep purple color and unique flavor, it has become a favorite among gardeners and chefs alike. However, growing purple kohlrabi can be a bit challenging, especially for beginners. In this article, we will delve into the world of purple kohlrabi, exploring its history, nutritional benefits, and most importantly, providing a step-by-step guide on how to grow this magnificent vegetable.
Introduction to Purple Kohlrabi
Purple kohlrabi is a cool-season crop, which means it thrives in the cooler temperatures of spring or fall. It is a cross between a cabbage and a turnip, with a bulbous stem that can be eaten raw or cooked. The purple variety is a result of careful breeding and selection, offering a sweet and slightly peppery flavor. Purple kohlrabi is rich in vitamins and minerals, including vitamin C, potassium, and fiber, making it an excellent addition to a healthy diet.
History of Kohlrabi
Kohlrabi has its roots in Europe, where it has been cultivated for centuries. The name “kohlrabi” comes from the German words “kohl,” meaning cabbage, and “rabi,” meaning turnip. It was first introduced to the United States in the 19th century and has since become a popular crop among gardeners and farmers. The purple variety, in particular, has gained popularity in recent years due to its unique color and flavor.
Nutritional Benefits
Purple kohlrabi is a nutrient-dense food, providing a range of health benefits when consumed. It is high in antioxidants, which help protect against cell damage and reduce the risk of chronic diseases. Additionally, purple kohlrabi is low in calories and rich in fiber, making it an excellent choice for those looking to manage their weight or improve their digestive health.
Growing Purple Kohlrabi
Growing purple kohlrabi requires careful planning and attention to detail. Here are the key steps to follow:
Choosing the Right Variety
When selecting a purple kohlrabi variety, look for seeds that are specifically labeled as “purple” or “deep purple.” Some popular varieties include ‘Purple Vienna’ and ‘Deep Purple.’ Make sure to choose a variety that is resistant to common kohlrabi pests and diseases, such as club root and aphids.
Preparing the Soil
Purple kohlrabi prefers well-draining, fertile soil with a pH between 6.0 and 7.0. Add compost or well-rotted manure to the soil to improve its fertility and structure. Remove any debris or weeds, and till the soil to a depth of 8-10 inches.
Sowing Seeds
Sow purple kohlrabi seeds in early spring or late summer, about 2-3 weeks before the last frost date. Sow seeds 1/4 inch deep and 2-3 inches apart in rows that are 12-18 inches apart. Water the soil gently but thoroughly after sowing, and keep the soil consistently moist during the first few weeks after sowing.
Thin Seedlings
Once the seedlings have 2-3 sets of leaves, thin them to 6-8 inches apart. This will give the remaining seedlings room to grow and develop properly. Use scissors or a sharp knife to cut the seedlings at soil level, rather than pulling them out, which can damage the surrounding roots.
Caring for Purple Kohlrabi
Once the seedlings are established, it’s essential to provide them with the right care. Here are some tips:
Watering
Purple kohlrabi needs consistent moisture, especially during the first few weeks after sowing. Water the soil deeply and regularly, providing about 1-2 inches of water per week. Avoid getting water on the leaves or crown of the plant, as this can lead to rot and other diseases.
Fertilization
Feed the plants with a balanced fertilizer once a month. Avoid over-fertilizing, which can lead to weak and leggy growth. Instead, opt for a slow-release fertilizer that provides a steady supply of nutrients.
Pest and Disease Management
Keep an eye out for common kohlrabi pests, such as aphids, slugs, and snails. Use organic or integrated pest management techniques, such as introducing beneficial insects or using neem oil, to control infestations. Regularly inspect the plants for signs of disease, such as yellowing leaves or black spots, and take action promptly if you notice any problems.
Harvesting Purple Kohlrabi
Purple kohlrabi is ready to harvest when the bulbous stem is between 2-3 inches in diameter. Use a sharp knife or pruning shears to cut the stem at soil level, leaving a small piece of stem attached to the root. Harvest the leaves and stems separately, using the leaves in salads or sautéed as a side dish.
Storage and Preservation
Purple kohlrabi can be stored in the refrigerator for up to 2 weeks. Keep the bulbous stem in a sealed container or plastic bag, and store the leaves in a separate container to maintain their freshness. You can also freeze or pickle purple kohlrabi to enjoy it year-round.
Conclusion
Growing purple kohlrabi is a rewarding experience that requires careful attention to detail and a bit of patience. By following the steps outlined in this article, you’ll be able to enjoy this stunning and nutritious vegetable in your garden or on your plate. Remember to choose the right variety, prepare the soil carefully, and provide consistent care and attention to your plants. With these tips and a bit of practice, you’ll be well on your way to becoming a purple kohlrabi expert.
| Variety | Maturity Days | Color |
|---|---|---|
| Purple Vienna | 55-60 | Deep Purple |
| Deep Purple | 60-65 | Purple |
- Choose a variety that is resistant to common kohlrabi pests and diseases
- Prepare the soil carefully, adding compost or well-rotted manure to improve its fertility and structure
What is Purple Kohlrabi and How Does it Differ from Green Kohlrabi?
Purple kohlrabi is a variety of kohlrabi that has a deep purple color and is slightly sweeter than its green counterpart. It is a cool-season crop that belongs to the Brassica family, which also includes cabbage, broccoli, and cauliflower. Purple kohlrabi has a similar texture to a water chestnut and can be eaten raw or cooked, making it a versatile ingredient in a variety of dishes. Its unique color and flavor make it a popular choice among chefs and home cooks looking to add some excitement to their meals.
In terms of cultivation, purple kohlrabi is similar to green kohlrabi and requires similar growing conditions. It prefers well-draining soil and full sun to partial shade, making it an ideal crop for gardens with a mix of sun and shade. Purple kohlrabi is also a fast-maturing crop, taking around 50-60 days to mature, which makes it a great choice for gardeners who want to quickly see the results of their labor. With its unique color and flavor, purple kohlrabi is a great addition to any garden, and its ease of cultivation makes it accessible to gardeners of all skill levels.
How Do I Plant Purple Kohlrabi Seeds for Optimal Growth?
To plant purple kohlrabi seeds for optimal growth, it’s essential to start with high-quality seeds and a well-prepared garden bed. The soil should be loose and well-draining, with a pH between 6.0 and 7.0. Sow the seeds 1-2 inches deep and 2-3 inches apart, in rows that are 12-18 inches apart. Water the soil gently but thoroughly after planting, and keep the soil consistently moist during the first few weeks after planting. You can also start the seeds indoors 4-6 weeks before the last frost date and then transplant them outside when the weather warms up.
It’s also crucial to provide the seedlings with enough light and temperature control. Purple kohlrabi prefers temperatures between 40°F and 75°F, making it an excellent crop for early spring or late summer/early fall. If you’re starting the seeds indoors, make sure to provide them with sufficient light, either through a sunny window or under grow lights. Transplant the seedlings outside when they have 2-3 sets of leaves, spacing them 6-8 inches apart to allow for proper air circulation and growth. With proper care and attention, your purple kohlrabi seeds should germinate and grow into healthy, robust plants.
What Kind of Soil Does Purple Kohlrabi Require for Healthy Growth?
Purple kohlrabi requires well-draining, fertile soil that is rich in organic matter. The ideal soil pH for growing purple kohlrabi is between 6.0 and 7.0, which is slightly acidic to neutral. You can test your soil pH using a soil testing kit and adjust it accordingly by adding lime to raise the pH or sulfur to lower it. It’s also essential to add compost or well-rotted manure to the soil to provide nutrients and improve its structure. This will help the roots of the purple kohlrabi plants to grow deep and strong, resulting in healthier and more robust plants.
In addition to pH and nutrient levels, the soil’s texture is also critical for growing purple kohlrabi. The soil should be loose and well-draining to prevent waterlogged soil, which can lead to root rot and other problems. If your soil is heavy clay or sandy, you can amend it by adding organic matter such as compost or well-rotted manure. This will help to improve the soil’s structure and drainage, creating an ideal environment for your purple kohlrabi plants to thrive. By providing your purple kohlrabi with the right soil conditions, you can ensure a bountiful harvest and enjoy this delicious and nutritious vegetable.
How Much Water Does Purple Kohlrabi Require, and How Often Should I Water It?
Purple kohlrabi requires consistent moisture, especially during the first few weeks after planting. The soil should be kept consistently moist, but not waterlogged, which can lead to root rot and other problems. Aim to provide about 1-2 inches of water per week, either from rainfall or irrigation. It’s essential to avoid overwatering, as this can lead to a range of problems, including root rot, leaf spot, and bolting. Check the soil regularly by inserting your finger into the soil up to the knuckle, and water only when the soil feels dry.
In terms of watering frequency, it’s best to water your purple kohlrabi plants deeply once or twice a week, depending on weather conditions. Avoid frequent shallow watering, which can encourage weak and shallow root growth. Instead, water your plants thoroughly, providing enough moisture to reach a depth of 6-8 inches. This will encourage deep root growth and make your plants more resilient to drought and other stresses. Mulching around the plants can also help to retain moisture in the soil and reduce the need for frequent watering. By providing your purple kohlrabi with the right amount of water, you can ensure healthy growth and a bountiful harvest.
What Are the Common Pests and Diseases That Can Affect Purple Kohlrabi, and How Can I Control Them?
Purple kohlrabi can be affected by a range of pests and diseases, including aphids, slugs, snails, and powdery mildew. Aphids are small, soft-bodied insects that can be controlled using neem oil or insecticidal soap. Slugs and snails can be controlled using copper tape or crushed eggshells around the plants, while powdery mildew can be controlled using fungicides or by removing infected leaves and improving air circulation. Regular monitoring of your plants is essential to catch any problems early, and taking action quickly can help to prevent the spread of pests and diseases.
To prevent pests and diseases from affecting your purple kohlrabi, it’s essential to maintain good garden hygiene and provide your plants with the right growing conditions. Remove any weeds that can harbor pests and diseases, and avoid overcrowding your plants, which can create a humid microclimate that fosters the growth of fungi and bacteria. You can also use row covers to prevent pests such as aphids and whiteflies from reaching your plants. By taking a proactive approach to pest and disease management, you can help to ensure a healthy and productive crop of purple kohlrabi.
How Do I Harvest Purple Kohlrabi, and What Are the Best Ways to Store It?
Purple kohlrabi is ready to harvest when the bulb is between 2-3 inches in diameter, and the leaves are still tender and flavorful. Use a garden fork to carefully loosen the soil around the plant, then lift it out of the ground. Trim the leaves and stems, and wash the bulb under cold running water to remove any dirt or debris. You can store purple kohlrabi in the refrigerator for up to 2 weeks, or in a cool, dark place for up to 1 month. You can also freeze or pickle the bulbs for longer-term storage.
When harvesting purple kohlrabi, it’s essential to handle the bulbs gently to avoid bruising or damaging them. Use a sharp knife or pruning shears to trim the leaves and stems, and avoid pulling on the leaves, which can cause the bulb to break off. You can also harvest the leaves and stems separately and use them in salads or sautéed as a cooking green. When storing purple kohlrabi, make sure to keep it away from direct sunlight and heat sources, which can cause it to spoil quickly. By following these tips, you can enjoy your homegrown purple kohlrabi at its best and make the most of your harvest.
Can I Grow Purple Kohlrabi in Containers, and What Are the Benefits of Doing So?
Yes, you can grow purple kohlrabi in containers, provided you have a large enough container with good drainage and plenty of sunlight. Choose a container that is at least 6-8 inches deep and 12-18 inches wide, and fill it with a well-draining potting mix. Plant the seeds 1-2 inches deep and 2-3 inches apart, and water them well. Container-grown purple kohlrabi requires more frequent watering than garden-grown plants, as the soil can dry out quickly. The benefits of growing purple kohlrabi in containers include flexibility, portability, and improved pest control.
Growing purple kohlrabi in containers can also help to extend the growing season, as you can move the containers to a protected location during extreme weather conditions. Additionally, container-grown plants are less susceptible to soil-borne pests and diseases, making them a great option for gardeners with limited space or poor soil. However, keep in mind that container-grown plants may require more frequent fertilization, as the soil can quickly become depleted of nutrients. By following these tips, you can successfully grow purple kohlrabi in containers and enjoy a bountiful harvest of this delicious and nutritious vegetable.