Water Mimosa (Neptunia oleracea)

Water Mimosa

Neptunia oleracea

Its fronds float like green lace on still water, a delicate aquatic edible. Aquatic herbaceous perennial; common name: water mimosa.

Full sun
continuous/week
Beginner
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Plant Needs

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Sunlight Full to partial sun; tolerates dappled shade in intense tropical heat
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Watering Grows in shallow, still or slow-moving freshwater; maintain consistent water depth
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Temperature Thrives in warm tropical temperatures; avoid drops below 12°C to prevent leaf dieback
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Characteristics

  • Leaf: Pinnately compound, touch-sensitive leaflets that fold when disturbed
  • Flower: Round, bright yellow pom-pom inflorescences, 1–2 cm in diameter
  • Stem: Slender, floating or trailing stems with adventitious roots at nodes
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Care Guide

Watering

Maintain water depth of 5–15 cm; refresh 20% of water weekly to prevent stagnation

Fertilization

Diluted aquatic fertilizer monthly. Use low-nitrogen fertilizer to minimize algal growth

Composted banana peel tea:Fully compost banana peels, dilute 1:40 with dechlorinated water, and pour into the pond; avoid adding solid peels to prevent odor
Pruning
  • Trim overgrown trailing stems to maintain a compact floating mat shape
  • Remove yellowing or damaged fronds to improve water circulation and appearance
  • Thin dense patches to allow sunlight to reach submerged lower foliage
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: Non-toxic; young shoots and leaves are edible when cooked

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Garden Uses & Culture

Culture: N/A

Usage: Edible young shoots and leaves (cooked); ornamental floating aquatic plant