Radish
Raphanus sativus · Brassicaceae
The gardener's calendar
Ideal time to plant radish: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Flowering
- Spring to early summer (white or pink flowers)
- Mature size
- 20 to 30 cm tall, fleshy root 2 to 10 cm depending on variety
- Growth
- Very fast (harvest in 25 to 60 days)
- Hardiness
- Low hardiness, prefers temperate temperatures
- Origin
- Southeast Asia (China, India)
- Soil type
- Well-draining, light, crumbly and fresh
- Exposure
- Sunny to partial shade
Care
Regular Watering
Your radish needs constantly moist but not waterlogged soil during growth. Water regularly, ideally every two to three days depending on climate conditions. Lack of water can make the root peppery or fibrous. Reduce watering after harvest if you keep the plants in place.
Light Exposure
Give your radish full sun for optimal growth. It tolerates light partial shade, especially in very hot climates, where it prevents the soil from drying too quickly. Less than 4 hours of direct light can slow root formation.
Soil Preparation
Prepare crumbly, organic-rich, well-draining soil without stones (which can cause forked roots). Work in well-decomposed compost before sowing. Avoid compacted or pure clay soils. A neutral to slightly acidic pH (6.0 to 7.0) is ideal.
Moderate Fertilization
Your radish is not demanding for fertilizer thanks to its short growing period. Adding compost at sowing is usually enough. If your soil is poor, light nitrogen fertilizer at the start of growth can boost foliage development.
Thinning Seedlings
After sprouting, thin seedlings to 5-8 cm apart depending on variety, to avoid root competition. This step is crucial for getting good-sized roots. You can eat the young thinned plants in salads.
Watch Out for Pests
Your radish fears aphids and flea beetles (small jumping beetles). Keep an eye on the foliage and use preventive measures like row covers or mulch. Fungal diseases are rare if drainage and air circulation are good.
Did you know?
The radish is one of the fastest-growing crops in horticultural history: ancient Egyptians were already cultivating it, and its presence is documented on tomb walls. In Asia, particularly in Japan and Korea, the daikon (giant radish) was traditionally fermented and stored as a winter food reserve. Its quick growth made it a symbol of renewal and speed in several cultures.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
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Tips generated and checked by Viridia — adapt them to your local climate.