Deep Water Culture
Hydroponic Kohlrabi: Growing Alien-Looking Brassicas Indoors
Complete guide to growing kohlrabi hydroponically. Learn nutrient requirements, variety selection, and harvesting tips for tender, flavorful bulbs year-round.
Growing Hydroponic Kohlrabi
Kohlrabi is one of the most unique-looking vegetables in the brassica family, with its alien-like swollen stem and sprouting leaves. This fast-growing cool-season crop thrives in hydroponic systems, producing tender, sweet bulbs perfect for fresh eating.
Why Grow Kohlrabi Hydroponically?
Hydroponic kohlrabi grows faster and produces more tender bulbs than soil-grown plants. The controlled environment eliminates common soil pests and diseases while allowing year-round production of this nutritious brassica.
Best Hydroponic Systems
Deep Water Culture (DWC) systems work excellently for kohlrabi, supporting the developing bulb above the water line. Nutrient Film Technique (NFT) also works well for smaller varieties. Ensure adequate spacing for bulb development.
Variety Selection
Purple Vienna and White Vienna are classic choices with excellent flavor. Kolibri and Kossak are larger varieties for substantial harvests. Purple varieties add visual interest to indoor gardens.
Nutrient Requirements
Maintain EC levels between 1.8-2.4 mS/cm and pH between 5.5-6.5. Kohlrabi benefits from higher nitrogen during early growth, transitioning to balanced nutrients as bulbs develop.
Temperature and Light
Kohlrabi prefers cool temperatures between 60-70°F (15-21°C). Provide 12-16 hours of bright light daily. Plants bolt quickly in warm conditions, so temperature control is essential for quality bulbs.
Germination and Transplanting
Start seeds in rockwool cubes or seedling plugs. Seeds germinate in 5-10 days. Transplant when seedlings have 2-3 true leaves, positioning the growing point above the net pot.
Bulb Development
The edible bulb is actually a swollen stem that forms above ground. Proper spacing (8-12 inches) allows bulbs to develop without crowding. Consistent nutrients and temperatures produce the sweetest flavor.
Harvesting for Best Quality
Harvest kohlrabi when bulbs reach 2-3 inches in diameter for the most tender texture. Larger bulbs become woody and fibrous. Cut the bulb from the plant and remove leaves for storage.
Culinary Uses
Kohlrabi has a mild, sweet flavor similar to broccoli stems. Enjoy raw in slaws, roasted, or added to stir-fries. The leaves are also edible and nutritious, similar to collard greens.
Common Issues
Watch for aphids and cabbage worms. Cracked bulbs indicate inconsistent watering or nutrient fluctuations. Woody texture results from delayed harvest or high temperatures during development.
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