Watercress
Nasturtium officinale · Brassicaceae
The gardener's calendar
Ideal time to plant watercress: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous, tender green
- Flowering
- April to September, small white flowers
- Adult size
- 30 to 60 cm in height
- Growth
- Fast
- Hardiness
- Moderate, prefers temperate and humid climates
- Origin
- Western and central Europe
- Soil type
- Fertile, moist, well-drained
Care
Watering
Watercress thrives in a very humid environment, ideally at the water's edge or partially submerged. Keep the soil constantly moist without waterlogging. Regular clear water supply is essential; water daily during active growth, especially in summer.
Light Exposure
Prefer a sunny to partially shaded location. Watercress tolerates partial shade, which is particularly beneficial in warm climates where it limits drying out. Prolonged indirect light promotes healthy growth and reduces premature bolting.
Soil and Substrate
Fertile soil rich in organic matter and constantly moist is ideal. Watercress adapts to slightly acidic to neutral soils. In soilless or container cultivation, use a well-draining mix that retains moisture, enriched with mature compost.
Fertilizer
Apply balanced diluted fertilizer every 2 to 3 weeks during the growing season. Light nitrogen input promotes foliage. Favor organic fertilizers for natural and sustainable cultivation.
Pruning and Harvesting
Regularly pinch the apex to encourage branching and limit seed set. Young leaves are harvested as needed. Light cutting every 15 to 20 days revitalizes the plant and ensures continuous production.
Pests and Diseases
Watercress is generally robust but can suffer from root rot if waterlogged for extended periods. Watch for aphids and whiteflies, common in humid climates. Ensure good air circulation and avoid stagnant excess moisture to prevent fungal issues.
Did you know?
Watercress was highly valued by ancient Roman nobility, who consumed it as a tonic and vitamin source. In the Middle Ages, monks cultivated watercress in monastery ponds, not only for its supposed health benefits but also for its ability to indicate water purity: vigorous prosperity was a sign of clean water. In France, the Eure Valley remains famous for its centuries-old watercress cultivation tradition, perpetuated since the 17th century.
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.