Lesser Bladderwort (Utricularia minor)

Lesser Bladderwort

Utricularia minor

Tiny bladder traps hunt aquatic microfauna, a quiet predator in still water. Aquatic carnivorous perennial; common name: Lesser Bladderwort.

Full sun
N/A/week
Moderate
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Plant Needs

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Sunlight Requires full to partial sun to support photosynthesis and trap function; avoid dense shade
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Watering Aquatic plant; maintain clean, still dechlorinated water with consistent depth
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Temperature Thrives in cool to temperate water; avoid temperatures above 28°C to preserve microfauna prey sources
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Characteristics

  • Leaf: Fine, thread-like submerged leaves with 1–2 mm bladder traps for capturing microfauna
  • Flower: Pale yellow, snapdragon-like blooms on 5–10 cm erect stems above water surface
  • Stem: Slender, branching floating stems with attached bladder structures for nutrient uptake
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Care Guide

Watering

Maintain consistent water level; top up with dechlorinated water as evaporation occurs

Fertilization

No supplemental fertilization needed; traps capture microfauna for nutrients. Do not use chemical fertilizers, as they can promote algae growth and harm trap function

Dechlorinated aquarium water runoff:Add 10–15% aquarium water to the container to introduce small aquatic organisms as food for bladder traps; avoid overloading to prevent algae blooms
Pruning
  • Trim dead flower stems to prevent decay in water and maintain water clarity
  • Thin overcrowded stems to improve light penetration to submerged leaves
  • Remove any algae growth from the water surface to avoid blocking sunlight
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No recorded toxicity to cats

Humans: No known toxic effects on humans

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Garden Uses & Culture

Culture: N/A

Usage: Aquatic ornamental plant; natural biological control for small aquatic microfauna