Description
Raphanus raphanistrum subsp. sativus, commonly known as the cultivated radish, is a fast-growing annual root vegetable prized for its crisp, edible taproot. Plants typically grow 15 – 45 cm tall, forming a rosette of rough, lobed leaves.
Roots vary widely in shape and color, from round to elongated, and from white and pink to red, purple, or black, depending on the variety. The flesh is usually white and has a sharp, peppery flavor due to natural mustard oils.
Radishes thrive in cool seasons, preferring full sun and well-drained, loose soil. They mature quickly, often within 3 – 6 weeks from sowing. Beyond their roots, young leaves are also edible and used in salads or as cooked greens.
Germination Guide
🌍 Eastern Mediterranean / Southeast Asia
Easy
Raphanus raphanistrum subsp. sativus (cultivated radish) germinates rapidly within 3-10 days under optimal conditions, earning its genus name from Greek 'ra' (quickly) and 'phainomai' (to appear)
Germination
Germination time
Expect germination in
3 – 10 days
Temperature
Min 18°C
Ideal 21°C
Max 29°C
🌡️ Temperature alternation recommended
— Alternating temperatures (7.5/22.5°C or 12.5/27.5°C) increase germination by 1.2-1.5x compared to constant temperatures
Substrate moisture
💧💧 High
Seed Pre-treatment
-
💧
Soaking — 24 hours
Soaking for 24 hours with priming agents (e.g., ascorbic acid, KNO3) can improve germination
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📋
Additional notes
Seed priming with ascorbic acid (0.01%) or KNO3 (1%) improves initial germination stages
Substrate & Container
Recommended substrate
Sandy loam or perlite with good drainage; light, loose, fertile soil rich in organic matter
Recommended container
Petri dishes, short glass jars, or rectangular plastic pots
Growing Tips
Keep soil consistently moist but not waterlogged; excess moisture causes rot. Best growth at 10-18°C for root quality. Direct sowing preferred over transplanting. Do not allow soil to dry completely. High temperatures (>29°C) inhibit root development and cause bitterness
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