Kohlrabi

Brassica oleracea var. gongylodes

vegetable

verifiedReviewed by the GreenScout Team

Kohlrabi is a quick-growing brassica that produces a swollen stem (knob) above ground with a mild, turnip-like flavor. It matures in 45–60 days and is more cold-tolerant than heat-tolerant, making it ideal for spring and fall gardens. Both the stem knob and tender leaves are edible.

Common Problems

Select the problem your Kohlrabi is experiencing to get a treatment guide.

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Slow Growthchevron_right

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Boltingchevron_right

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Holes In Leaveschevron_right

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Yellow Leaveschevron_right

Care Guide

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Light

Full sun, 6–8 hours daily; light afternoon shade in hot climates beneficial

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Water

Keep soil consistently moist with 1–1.5 inches per week; irregular watering causes tough, woody texture

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Soil

Well-draining, fertile loam with pH 6.0–7.5; add compost before planting

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Fertiliser

Apply balanced fertilizer (10-10-10) every 3–4 weeks; avoid excess nitrogen which promotes leaf growth over knob development

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Temperature

Optimal at 60–70°F (16–21°C); bolts quickly above 75°F (24°C); harvest knobs at 2–3 inches diameter before toughening

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Humidity

Moderate humidity (50–70%); good air circulation prevents fungal issues

Toxicity

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Non-toxic; safe for all members of the household

Common Diseases

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Common Pests

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Seasonal Care

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Resume regular watering and feeding as growth picks up.

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Peak growing season. Water and feed regularly.

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Reduce watering as growth slows. Stop heavy feeding.

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Minimal watering and feeding. Protect from frost if needed.

Frequently Asked Questions

When should I harvest Kohlrabi knobs?

Harvest at 2–3 inches in diameter before they toughen — kohlrabi matures quickly in 45–60 days, and knobs left too long on the plant become woody and lose their mild, turnip-like flavor.