Sensitive Brier (Mimosa quadrivalvis)

Sensitive Brier

Mimosa quadrivalvis

Its leaves fold at touch, a playful, responsive wildflower. Perennial herbaceous legume; common names: sensitive brier, fourvalve mimosa.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; thrives in open, unshaded meadows and roadside habitats
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Watering Water deeply when the top 5 cm of soil dries out; highly drought-tolerant once established
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Temperature Hardy to USDA zones 5–9; tolerates mild winter frost and summer heat up to 35°C
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Characteristics

  • Leaf: Pinnately compound, touch-sensitive; folds inward within seconds of disturbance
  • Flower: Round, pink pom-pom inflorescences with fragrant, tiny florets
  • Stem: Slender, covered in small, sharp thorns for herbivore defense
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Care Guide

Watering

Water regularly during active growth to support blooming; avoid waterlogging

Fertilization

Diluted organic feed once monthly. Use low-nitrogen fertilizer to support flower production rather than foliage growth

Eggshell powder topdressing:Crush dried eggshells into fine powder; sprinkle lightly on soil surface to boost calcium levels for healthy root development
Pruning
  • Trim back dead or damaged stems in early spring to encourage new growth
  • Remove spent flower heads to promote extended blooming through late summer
  • Thin overcrowded clumps to improve air circulation and reduce pest risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No documented toxicity to cats

Humans: No known toxic effects from ingestion or contact

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Garden Uses & Culture

Culture: N/A

Usage: Wildflower garden ornamental; provides nectar for bees and butterflies