Watercress

Nasturtium officinale

vegetable

verifiedReviewed by the GreenScout Team

Watercress is a nutrient-dense, peppery leafy green that thrives in wet environments and shallow water. It grows vigorously from stem cuttings or seeds and can be harvested repeatedly for months. This semi-aquatic vegetable is rich in vitamins and minerals and adds a distinctive peppery bite to salads and soups.

Common Problems

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

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Wiltingchevron_right

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Yellow Leaveschevron_right

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Slow Growthchevron_right

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Root Rotchevron_right

Care Guide

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Light

Partial shade to full sun; prefers 4–6 hours of direct light. Too much intense sun can stress the plant; dappled light is ideal.

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Water

Requires consistently wet or waterlogged soil—essentially mimicking shallow stream conditions. Keep roots submerged or in perpetually moist soil. Standing water or hydroponic systems work well.

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Soil

Prefers sandy or silty, well-draining soil with high moisture retention. Can also grow in gravel or hydroponic media. Rich organic content is beneficial but not essential; watercress tolerates poor soils.

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Fertiliser

Light feeder. Minimal fertilization needed if grown in nutrient-rich water or amended soil. A weak liquid fertilizer every 4–6 weeks supports growth.

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Temperature

Prefers cool temperatures of 50–65°F (10–18°C). Tolerates cold well and can overwinter in mild climates. Heat and drought stress the plant.

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Humidity

Thrives in high humidity; naturally adapted to wet, humid stream environments. Misting is beneficial in dry indoor settings.

Toxicity

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Watercress is safe and nutritious for all family members and pets when properly cleaned.

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

Does Watercress really need to grow in water?

It requires consistently wet or waterlogged soil, essentially mimicking shallow stream conditions — keep roots submerged or in perpetually moist soil; standing water or hydroponic systems work especially well.

Can I keep harvesting the same Watercress plant?

Yes — it grows vigorously from stem cuttings or seeds and can be harvested repeatedly for months, making it a productive, low-effort peppery green once established.