Water Hyacinth (Eichhornia crassipes)

Water Hyacinth

Eichhornia crassipes

Floating blooms paint still waters purple, a tropical aquatic gem. Free-floating aquatic perennial; common name: water hyacinth.

Full sun
N/A/week
Beginner
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Plant Needs

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Sunlight Requires full to partial direct sunlight for consistent flowering; tolerates lightly shaded calm water
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Watering Requires continuous submersion in clean, still or slow-moving water; avoid stagnant, polluted water sources
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Temperature Thrives in warm tropical to subtropical temperatures; will die back if water drops below 10°C
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Characteristics

  • Leaf: Round, glossy green floating leaves with inflated petioles for buoyancy
  • Flower: Dense spikes of pale purple flowers with a bright yellow central spot
  • Root: Feathery, fibrous dangling roots that absorb nutrients from water
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Care Guide

Watering

Maintain water depth of 15–30 cm; replace 1/3 of water monthly to prevent stagnation

Fertilization

Dilute aquatic fertilizer monthly to support flowering. Use low-nitrogen fertilizer to favor flower production over foliage growth

Banana peel compost tea:Compost banana peels fully, steep in water for 3 days, dilute 1:20, and pour into water to boost flower development without causing algae blooms
Pruning
  • Remove dead, yellowing leaves and spent flower spikes to maintain water clarity
  • Thin overcrowded rosettes to improve water flow and light penetration
  • Trim tangled, overgrown roots to prevent blockages in small water containers
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no adverse effects reported

Humans: No known toxic effects to humans from ingestion or contact

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Garden Uses & Culture

Culture: Symbolizes aquatic resilience; used in traditional folk practices for water purification

Usage: Ornamental water feature plant; effective for phytoremediation of nutrient-rich water