True Watercress

Rorippa nasturtium-aquaticum, Brassicaceae

Zones

3–9

Layer

Herbaceous

Lifespan

Perennial

Growth

Fast

Guild Roles

ProducerBeneficial Insect HabitatPest Confuser

Growing Conditions

Sun

Partial Shade (preferred)Full Sun (tolerated)

Water

High (established)High (seedling)

Soil pH

6.5 – 8

Tolerances

Drought

Frost

Heat

Pest Resistance

Disease Resist.

Companion Plants

BrooklimeVeronica beccabunga

Pollinator SharingBeneficial Insect Habitat

Creeping Primrose-willowLudwigia repens

Pest DeterrentNutrient Accumulation

Marsh SpeedwellVeronica scutellata

Pest DeterrentPollinator Sharing

Antagonistic Plants

Tea TreeMelaleuca alternifolia

Tea tree essential oils may have allelopathic effects on watercress growth

Round-leaf Monkey-flowerMimulus glabratus

Brassicaceae species like watercress can produce allelopathic compounds affecting other wetland plants

Uses

Functions

Water FiltrationNutrient CyclingEdible ProductionStream PurificationErosion Control

Edible Parts

LeavesStemsFlowers

Medicinal Uses

Vitamin C SourceRespiratory HealthDetoxification

Common Questions

What zones does True Watercress grow in?

True Watercress grows in USDA hardiness zones 3 through 9.

What are good companion plants for True Watercress?

Good companions for True Watercress include Brooklime, Creeping Primrose-willow, Marsh Speedwell.

Design guilds with True Watercress and see companion relationships visually.

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