Mermaidweed (Proserpinaca palustris)

Mermaidweed

Proserpinaca palustris

Its feathery submerged leaves bring delicate aquatic texture. Semi-aquatic herbaceous perennial; common name: marsh mermaidweed.

Partial sun
3–4/week
Beginner
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Plant Needs

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Sunlight Bright indirect to partial direct sunlight; tolerates moderate shade in aquatic settings
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Watering Keep substrate or water consistently moist; for aquatic cultivation, maintain clean, well-oxygenated water
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Temperature Thrives in 15–25°C; can tolerate brief cool spells down to 5°C
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Characteristics

  • Leaf: Submerged leaves are finely divided, feather-like; emergent leaves are linear to oblong with serrated margins
  • Flower: Tiny, greenish-white blooms clustered in axillary spikes
  • Stem: Slender, branching, flexible to adapt to moist soil or submerged conditions
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Care Guide

Watering

Refresh aquatic water weekly; keep terrestrial soil evenly moist

Fertilization

Diluted aquatic fertilizer monthly. Use low-nitrogen fertilizer to prevent excessive algae growth in aquatic setups

Aquarium water runoff:Use dechlorinated aquarium water to top up terrestrial or aquatic setups; avoid overuse to prevent nutrient buildup
Pruning
  • Trim overgrown emergent stems to maintain desired shape and reduce overcrowding
  • Remove dead submerged foliage to improve water circulation and light penetration
  • Thin dense plant clusters in spring to encourage healthy new growth
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxic effects on humans

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Garden Uses & Culture

Culture: N/A

Usage: Aquatic ornamental for ponds and aquariums; bog garden ground cover