Why You'll Love It
Kohlrabi, a member of the Brassica family, is a fascinating and delicious vegetable that offers a unique gardening experience. Its distinctive swollen stem, which grows above ground, resembles a turnip but tastes milder and sweeter, akin to a blend of cabbage and apple. Gardeners appreciate Kohlrabi for its fast growth, allowing for multiple harvests in a single season. The plant's unusual appearance adds visual interest to any garden, and its versatility in the kitchen makes it a culinary delight. Both the bulb and the leaves are edible, providing a continuous supply of fresh produce. Its adaptability to various growing conditions makes it a rewarding choice for both novice and experienced gardeners. The satisfaction of harvesting your own fresh, flavorful Kohlrabi is truly unmatched.
The Story
Kohlrabi, scientifically known as Brassica oleracea Gongylodes Group, originated in Northern Europe, likely as a result of selection from wild cabbage varieties. Its cultivation dates back to the 15th century, with evidence suggesting its presence in gardens across Europe. The name "Kohlrabi" comes from the German words "Kohl" (cabbage) and "Rabi" (turnip), reflecting its appearance and flavor profile. While not deeply embedded in ancient mythology or folklore, Kohlrabi has become a staple in many European and Asian cuisines. It gained popularity in the United States in the 19th century and continues to be cultivated for its unique taste and nutritional benefits. Today, Kohlrabi is recognized as a versatile and healthy vegetable, enjoyed in various culinary preparations around the world.
Complete Care Guide
Kohlrabi requires well-draining soil rich in organic matter. Plant seeds directly in the garden or start indoors 4-6 weeks before the last frost. Space plants 6-8 inches apart in rows 12-18 inches apart. Water regularly, keeping the soil consistently moist but not waterlogged. Fertilize every 2-3 weeks with a balanced fertilizer, paying attention to potassium levels to promote strong bulb development. Kohlrabi prefers full sun but can tolerate partial shade, especially in warmer climates. Harvest when the bulb reaches 2-3 inches in diameter for the best flavor and texture. Protect from pests like cabbage worms and aphids with appropriate organic pest control methods. Rotate crops annually to prevent soilborne diseases.
Light Requirements
Kohlrabi thrives in full sun, requiring at least 6 hours of direct sunlight per day to produce healthy bulbs. Insufficient light can lead to leggy growth and smaller, less flavorful bulbs. In hotter climates, providing some afternoon shade can prevent the plant from bolting (prematurely going to seed). When growing indoors, place Kohlrabi near a south-facing window or use grow lights to supplement natural light. Rotate the plants regularly to ensure even light exposure on all sides. Monitor the leaves for signs of insufficient light, such as pale color or elongated stems, and adjust the light accordingly.
Seasonal Care
Spring
In spring, start seeds indoors or directly sow outdoors after the last frost. Ensure adequate sunlight and consistent watering. Fertilize regularly to promote strong growth. Monitor for pests and diseases.
Summer
Provide shade during the hottest part of the day to prevent bolting. Water deeply and regularly, especially during dry periods. Continue to fertilize as needed. Harvest bulbs when they reach the desired size.
Fall
Plant a fall crop of Kohlrabi for a late-season harvest. Protect plants from frost with row covers or mulch. Continue to water and fertilize as needed.
Winter
In colder climates, Kohlrabi can be grown indoors under grow lights. Provide adequate light, water, and fertilization. Monitor for pests and diseases.
The Life of Your Kohlrabi
Seedling / Juvenile
Start seeds indoors 4-6 weeks before the last frost. Use a seed-starting mix and keep the soil moist. Provide adequate light with grow lights or a sunny window. Harden off seedlings before transplanting outdoors, gradually exposing them to outdoor conditions.
Adolescent
Once transplanted, ensure consistent watering and fertilization. Monitor for pests and diseases, taking action as needed. Thin plants to allow for proper spacing. Provide support if necessary, especially for larger varieties.
Mature
As the bulb develops, continue to water and fertilize regularly. Check the size of the bulb frequently. Harvest when the bulb reaches 2-3 inches in diameter for the best flavor and texture.
Established
After harvesting the bulb, you can continue to harvest the leaves as needed. Remove any remaining plant debris to prevent disease. Consider planting another crop for a continuous harvest.
Propagation Guide
Kohlrabi is typically propagated by seed, but it is possible to propagate it through vegetative methods, although less common.
Division: This method is rarely used for Kohlrabi.
Stem Cuttings: Although not the standard method, you can attempt to take stem cuttings from young, healthy plants. Select a stem with several leaves. Dip the cut end in rooting hormone and plant it in a well-draining potting mix. Keep the soil moist and provide humidity by covering the cutting with a plastic bag or dome. Rooting can take several weeks.
Keiki: Kohlrabi does not naturally produce keikis.
Expert Knowledge
To maximize your Kohlrabi harvest, select varieties that are well-suited to your climate. Consider succession planting to ensure a continuous supply of fresh bulbs. Regularly check the soil pH and amend as needed. Proper spacing is crucial for optimal bulb development. Avoid over-fertilizing, as this can lead to excessive leaf growth and smaller bulbs. Rotate crops annually to prevent soilborne diseases.
Troubleshooting
Yellow leaves
Yellow leaves can indicate nutrient deficiencies, overwatering, or pest infestations. Test the soil and amend as needed. Adjust watering practices. Inspect for pests and treat accordingly.
Brown leaf edges
Brown edges on leaves often suggest a lack of potassium or calcium, or potentially fertilizer burn. Amend with a potassium supplement or bone meal. Ensure proper watering to avoid salt buildup.
Drooping leaves
Drooping is often caused by underwatering, heat stress, or root damage. Water deeply and regularly. Provide shade during the hottest part of the day. Avoid disturbing the roots.
Root rot
Root rot is caused by overwatering and poor drainage. Improve drainage by amending the soil with perlite or sand. Avoid overwatering. Use a fungicide if necessary.
Pests
Pests like cabbage worms and aphids can damage Kohlrabi. Use organic pest control methods such as insecticidal soap or neem oil. Handpick pests when possible.
Frequently Asked Questions
What are the ideal light conditions?
Kohlrabi needs at least 6 hours of direct sunlight.
How often should I water?
Water Kohlrabi regularly, keeping the soil consistently moist.
When should I repot?
Kohlrabi is not typically repotted as it is grown in the ground.
Is it toxic to pets?
Kohlrabi is not toxic to pets or children.
How big will it grow?
Kohlrabi bulbs typically grow to 2-3 inches in diameter.
Can I propagate at home?
Kohlrabi is typically propagated by seed.
