Marsh Yellowcress (Rorippa palustris)

Marsh Yellowcress

Rorippa palustris

Bright yellow blooms bring cheerful color to wet habitats. Herbaceous annual or perennial; common name: bog yellowcress.

Full sun
3–5/week
Beginner
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Plant Needs

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Sunlight Prefers full sun to partial shade; tolerates reduced light in boggy wetland settings
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Watering Keep soil consistently moist; tolerates shallow standing water for extended periods
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Temperature Hardy to 0°C; thrives in cool to temperate temperatures; avoid prolonged exposure to heat above 30°C
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Characteristics

  • Leaf: Basal leaves are lobed or coarsely toothed; stem leaves are smaller, lanceolate with smooth or finely toothed margins
  • Flower: Tiny four-petaled bright yellow blooms arranged in terminal racemes
  • Stem: Slender, branching stems, often reddish at the base
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Care Guide

Watering

Maintain continuously moist soil; submerge lower stems in 1–2 cm of water if growing in a bog setting

Fertilization

Diluted organic feed every 2 weeks. Use balanced, low-nitrogen feed to avoid excessive foliage growth at the expense of blooms

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours; dilute 1:20 for root drench; discard solids to prevent odor and pest attraction
Pruning
  • Deadhead spent blooms regularly to encourage extended flowering through the growing season
  • Trim back overgrown or leggy stems in late autumn to maintain a compact habit
  • Remove yellowing or damaged leaves to improve airflow and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no known adverse effects from ingestion

Humans: Non-toxic to humans; young leaves are edible when cooked or raw in small quantities

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Garden Uses & Culture

Culture: N/A

Usage: Edible young leaves can be used in salads, soups, or cooked as a leafy green; ornamental wetland groundcover