Least Duckweed (Lemna minuta)

Least Duckweed

Lemna minuta

Tiny floating fronds bring delicate texture to still water. Smallest duckweed species; common name: Least Duckweed.

Partial sun
0/week
Beginner
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Plant Needs

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Sunlight Bright indirect light; tolerates partial shade; avoid prolonged midday direct sun which can scorch delicate fronds
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Watering Grows in still, clean freshwater; maintain consistent water level and avoid stagnation with gentle aeration
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Temperature Thrives in 15–25℃; tolerates brief dips to 5℃ but avoid freezing temperatures
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Characteristics

  • Frond (Leaf): Oval to oblong bright green fronds, 1–3 mm long, with one fine root per frond
  • Flower: Inconspicuous tiny greenish flowers enclosed in a membranous sac; rarely blooms outside natural habitats
  • Growth Habit: Forms dense, thin floating mats on still freshwater surfaces
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Care Guide

Watering

Maintain clean, still freshwater; top up evaporated water as needed

Fertilization

Diluted aquatic plant fertilizer once monthly. Use low-nitrogen fertilizer to avoid excessive algae growth

Composted banana peel tea:Fully compost banana peels, steep in water for 3 days, dilute 1:50 before adding to water feature; avoid raw peels to prevent water fouling
Pruning
  • Thin overcrowded fronds to maintain water flow and prevent oxygen depletion in the water column
  • Remove brown or decaying fronds promptly to avoid water contamination and algae blooms
  • Skim excess floating mats to keep the water feature visually balanced and healthy
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirmed non-toxic to cats; no harmful compounds present

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

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Garden Uses & Culture

Culture: N/A

Usage: Aquatic ornamental for small ponds, aquariums, or tabletop water features; natural water purifier by absorbing excess nutrients