Brassica rapa subsp. rapa

Turnip Growing & Harvesting Guide

Turnip (Brassica rapa subsp. rapa) is the classic, dual-purpose favorite of the cool-season vegetable garden. PRIZED for both its sweet, white-purple roots and highly nutritious green leaves, this fast-growing brassica produces heavy crops with minimal effort.

Sunlight Full Sun / Partial Shade

Watering Consistent / Deep

Soil pH Rich, Fast-Draining (pH 6.0-6.8)

Target Temp 10°C - 20°C

Toxicity Pet Friendly (Non-toxic)

Botanical macro photography of Turnip (Brassica rapa subsp. rapa) - Plant AI care database

How to Identify Turnip

Turnip (Brassica rapa subsp. rapa) is a highly valued edible crop globally. Recognizing its definitive vegetative and fruit/vegetable structures is key to successful companion growing and harvesting.

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Key Visual Features: Low-growing rosettes of deeply lobed green leaves with hairy textures.
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Leaf & Stems: Thick, hairy green leaves; flower stalks developing terminal yellow blossoms in the second year.
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Fruit/Edible Part: A single round, white-fleshed root with a distinct purple shoulder where exposed to sunlight.

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Complete Growing & Harvesting Guide

Follow our detailed scientific agricultural cultivation guide to keep your Turnip thriving and high-yielding.

Water deeply once a week, receiving 1 to 1.5 inches of water. Maintain consistent soil moisture to prevent tough, bitter roots.

Prune away dead outer foliage. Thin young turnip seedlings diligently to 4 inches apart to ensure proper root room.

Apply low-nitrogen, high-potash organic fertilizer. Avoid high-nitrogen feeds which cause massive leaves but small roots.

Thrives in full sun but easily tolerates partial shade. Afternoon shade prevents leaves from wilting in warm climates.

Prefers fertile, fast-draining sandy loam rich in organic compost (pH 6.0-6.8). Clay soils cause roots to stunt.

Sow seeds directly outdoors in early spring or late summer once soil is workable. Plant seeds very shallow (1/2 inch).

Thrives in cool climates. Ideal temperature range is 10°C-20°C. Highly frost-tolerant; light winter frosts sweeten roots.

Thin turnips to 4 inches apart in rows spaced 12 inches apart. Crowded plants fail to form round roots.

Prone to flea beetles, cabbage root maggots, and aphids. Use physical mesh row covers proactively from seeding.

Susceptible to Clubroot and Downy Mildew. Practice 4-year crop rotation and ensure excellent soil hygiene.

Harvest when roots reach 2-3 inches in diameter for peak tenderness. Pull gently after wetting soil.

Common Diseases & Treatment

Clubroot (Plasmodiophora)

Symptoms: Foliage wilts during hot days, leaves turn yellow, and roots develop massive, distorted, club-like galls.

Action: Raise soil pH above 7.0 using agricultural lime, practice strict 4-year brassica crop rotation, and discard infected roots.

Downy Mildew (Hyaloperonospora)

Symptoms: Upper leaf surfaces show angular yellow-brown spots, with gray-purple fuzzy mold on damp undersides.

Action: Ensure wide spacing for wind movement, avoid overhead watering, and spray copper fungicide proactively.

Frequently Asked Questions

Can I harvest both the turnip roots and green leaves?

Yes! Turnips are a dual-purpose crop. Harvest outer leaves sparingly for cooking, and pull the roots at mature size.

Why are my turnip roots so small and bitter?

High nitrogen fertilizer, over-crowding, or hot weather during root swelling cause turnips to become tough and bitter.

Does frost improve the flavor of turnips?

Yes! Light winter frosts trigger the plant to convert starches into sugars, producing exceptionally sweet, mild roots.

Are cooked turnip greens safe for dogs?

Yes. Cooked turnip roots and green leaves are completely non-toxic and pet-safe in small quantities. They provide healthy fiber.