Water Paspalum (Paspalum distichum)

Water Paspalum

Paspalum distichum

Dense spreading grass stabilizes wet soils, a quiet guardian of shorelines. Perennial aquatic/terrestrial grass; common names: Water Paspalum, Knotgrass.

Full sun
3–7/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates prolonged flooded or waterlogged growing conditions
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Watering Keep soil consistently moist or submerged 1–5 cm deep; avoid complete drying of root zones
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Temperature Thrives in warm temperatures; tolerates light frost but dies back during hard freezes
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Characteristics

  • Leaf: Linear, flat, 2–15 cm long, bright green with smooth margins.
  • Stem: Creeping stolons that root at nodes to form continuous ground cover.
  • Inflorescence: Paired, slender racemes bearing small, greenish spikelets.
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Care Guide

Watering

Maintain continuous soil moisture or shallow submergence

Fertilization

Light, balanced feed once monthly. Avoid over-fertilizing to prevent algal growth in aquatic growing conditions

Banana peel compost tea:Use fully composted banana peels; dilute 1:20 for root drench to avoid nutrient buildup
Pruning
  • Trim overgrown mats in early spring to maintain desired coverage
  • Remove dead foliage to improve airflow and reduce pest habitat
  • Thin dense patches to prevent overcrowding and promote even growth
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic to cats; no reported toxicity

Humans: Non-toxic to humans; no known adverse health effects from ingestion or contact

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Garden Uses & Culture

Culture: N/A

Usage: Erosion control, wetland restoration, livestock forage