Water Starwort (Callitriche palustris)

Water Starwort

Callitriche palustris

Delicate floating foliage creates quiet aquatic charm. Aquatic herbaceous perennial; common name: water starwort.

Partial sun
continuous/week
Beginner
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Plant Needs

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Sunlight Bright indirect light; tolerates partial shade; avoid prolonged midday direct sun that may overheat shallow water
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Watering Requires consistent shallow freshwater; maintain water depth of 5–20 cm and avoid stagnant, low-oxygen conditions
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Temperature Thrives in cool to temperate water; avoid temperatures above 28°C which may cause foliage dieback
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Characteristics

  • Leaf: Small, linear to spatulate floating leaves; submerged leaves are thread-like and translucent
  • Flower: Tiny, inconspicuous greenish flowers without petals, clustered at stem nodes
  • Stem: Slender, branching stems that root at nodes in shallow freshwater
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Care Guide

Watering

Maintain consistent water level; top up with dechlorinated water as needed

Fertilization

Diluted aquatic fertilizer application once monthly. Use low-nitrogen fertilizer to minimize algae growth while supporting foliage health

Composted banana peel extract:Fully compost banana peels, steep in dechlorinated water for 3 days, dilute 1:50 before adding to water; avoid overfeeding to prevent algae blooms
Pruning
  • Trim overgrown floating mats to prevent overcrowding and maintain water flow
  • Remove yellowing submerged stems to reduce organic waste buildup
  • Thin dense foliage to allow light penetration for submerged leaf growth
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: 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: Aquatic ornamental; natural water filtration aid in small ponds