Loading…
🔍 Click to enlargeherbperennial💧 Hydroponic-Compatible
Watercress
Nasturtium officinale
Peppery aquatic herb that naturally thrives in flowing water. Nutrient-dense superfood.
Quick Facts
Sun:⛅ Partial Shade, ☀️ Full Sun
Water:💧💧💧 High
USDA Zones:Zones 3–11
Space:🪴 Container, 🌱 Small Bed
Soil:Loam, Silty
Best Season(s):Spring, Fall, Winter
Experience Level:🌱 Beginner
Native Range:Europe & Central Asia
Bloom Color:Small white flowers
Bloom Cycle:Spring through summer
Days to Harvest:15–25 days
Harvest Pattern:Continuous / cut-and-come-again
Care Notes
Needs consistently moist to wet conditions. Harvest tips regularly to prevent bolting.
💧 Hydroponic Notes
Watercress is practically made for hydroponics — it naturally grows in streams. NFT or DWC systems are ideal. Grows extremely fast. Great starter crop for new hydro gardeners.
Growing Details
Mature Size:6-10 in tall, spreading 1-3 ft as trailing stems root at nodes
Growth Rate:🐇 Fast
Zone Performance
Watercress is grown as a perennial only where a source of cool, continuously flowing water is available, which limits its true zone dependence; in colder Zone 3-5 gardens without a natural spring or stream it is typically grown as an annual in containers of standing water, while gardeners in milder Zone 7-11 areas with access to a spring-fed stream can maintain a truly perennial, self-sustaining patch.
Companions & Wildlife
🦌 Deer Resistance
occasionally damaged
Watercress has a peppery flavor that offers some natural deterrence, but its location in wet, low-lying areas near water sources brings it into frequent contact with browsing deer.
🐝 Pollinator Value
moderate
The small white flower clusters attract hoverflies and small native bees, though most gardeners harvest the plant before it flowers heavily.
Good Companions
Mint — Both thrive in consistently moist to boggy soil, making them natural bed-mates in a wet, partly shaded corner of the garden.
Lettuce — Watercress can be grown at the moist margins of a lettuce bed, sharing similar cool-season, high-moisture preferences.
Chives — Chives tolerate the same rich, consistently damp soil watercress needs and add pest-deterrent value at the bed's edge.
Troubleshooting
⚠️ Bolting and turning bitter in warm weather
Harvest stem tips continuously to delay flowering, and provide afternoon shade once temperatures climb above 75°F.
⚠️ Stagnant water causing rot and mosquito breeding
Grow in a container with a slow trickle of fresh water or change standing water every 2-3 days.
⚠️ Leaf spot or fungal disease in dense, humid plantings
Thin stems to improve air circulation and avoid letting water become stagnant or nutrient-fouled.
⚠️ Slow establishment from seed
Start from stem cuttings rooted directly in water instead of seed for faster, more reliable establishment.
✅ Pet Safety
Non-toxic to cats and dogs.
Informational only — always check with a veterinarian if you suspect your pet has eaten something it shouldn't have.
🌿 Traditional & Medicinal Use
A well-documented dietary source of vitamins A, C, K — food value, not a medicinal preparation.
Informational only, not medical advice — consult a healthcare provider before using any plant medicinally.