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Low toxicity🍽️ Edible💊 Medicinal☠️ To avoid

💧 Watercress

Nasturtium officinale · Brassicaceae

🌳 Temperate Europe🏔️ Mountains
🧠 To remember it“Wild watercress: never raw, the fluke lurks” — the rule to prevent fascioliasis: systematically cook any watercress that doesn't come from a controlled watercress farm.
Watercress — Nasturtium officinale

🔍 Identify it without mistakes

Creeping and floating aquatic plant, hollow stems often reddish that root at each node in the current, compound leaves with shiny rounded leaflets, small cross-shaped white flowers. Grows in dense mats in springs and fresh, clear streams, never in stagnant or doubtful water.

  1. creeping, floating or submerged hollow stems, rooting at each node
  2. pinnately compound leaves, 3-9 shiny rounded leaflets, the terminal one being larger
  3. small white flowers with 4 cross-shaped petals, growing in clusters
  4. always grows in direct contact with running water (spring, stream)
  5. immediate peppery-spicy taste when a leaf is crushed
Size10-60 cm (creeping stems)
FloweringMay-October
Habitatsprings, clear running water streams, ditches fed by fresh water — never in stagnant water or downstream from pastures

⚠️ Not to be confused with

Fool's watercress (deadly), which grows in the same ditches (Apium nodiflorum)no direct deadly confusion documented between the two, but the real risk comes from fool's watercress (Helosciadium nodiflorum) and especially nearby toxic Apiaceae plants (hemlock, hemlock water-dropwort) that share the same habitat

To tell them apart: watercress has ROUNDED leaves and a clear peppery smell; toxic Apiaceae in the same environment have deeply cut lace-like leaves and a different smell — if in doubt botanically in a ditch, refrain

Cuckoo flower (lady's smock) (Cardamine pratensis)cuckoo flower grows out of the water and does not carry the risk of liver fluke, unlike watercress which grows in running water and must be cooked

To tell them apart: cuckoo flower has clearly visible purple flowers and grows in damp grass, never submerged; watercress has creeping and floating stems growing directly in the current

🍽️ Eating it

Partsleaves, young stems
Seasonyear-round, best before flowering
Tastespicy-peppery, similar to strong arugula

Preparation : ALWAYS cook or blanch in boiling water before eating when the origin is not guaranteed (controlled cultivation): cooking kills liver fluke larvae (Fasciola hepatica) that wild watercress can carry if it grows downstream from sheep or cattle pastures; raw only for watercress grown in controlled ponds

11kcalEnergy
2.3gProtein
0.1gFat
1.3gCarbs
43mgVitamin C
120mgCalcium

USDA FoodData Central, cultivated raw watercress, per 100 g

💊 Healing with it

traditionally antiscorbutic and spring depurative, rich in vitamin C and glucosinolates

Level of evidence : traditional use — FWS Ecological Risk Screening Summary; CDC — Fasciola

⚠️ DANGER: wild watercress picked in open water can harbor encysted larvae (metacercariae) of the liver fluke (Fasciola hepatica) if cattle or sheep graze upstream; the disease (fascioliasis) affects the liver and can be serious — systematically cook watercress from wild or uncertain sources

🪓 Other bushcraft uses

  • cultivated in ponds fed by controlled springs (watercress farms) since the 19th century in France, specifically to avoid the liver fluke risk associated with wild foraging
Sources (4)

No entry replaces a certain identification in the field, or medical advice. When in doubt: don't eat it. If ingestion is suspected: poison control or 112/911.