Lesser Trefoil (Trifolium dubium)

Lesser Trefoil

Trifolium dubium

Tiny yellow blooms carpet lawns like scattered sunshine. Low-growing herbaceous perennial; common names: lesser trefoil, yellow clover.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates frequent mowing in lawn settings
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Watering Water deeply during prolonged dry spells; tolerates moderate drought once established
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Temperature Cold hardy to -15°C; withstands summer heat up to 30°C; enters dormancy in severe winter conditions
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Characteristics

  • Leaf: Trifoliate, small oval leaflets with faint white chevron markings
  • Flower: Dense spherical yellow flower heads, 3–6 mm in diameter
  • Stem: Slender, creeping or ascending stems that root at leaf nodes
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Care Guide

Watering

Keep soil slightly moist during active growth; rely on natural rainfall where possible

Fertilization

No regular fertilization needed; high-nitrogen feeds may suppress growth. Nitrogen-fixing nodules on roots naturally improve soil fertility over time

Banana peel compost tea:Use fully composted banana peels steeped in water; dilute 1:20 for root drench to support flowering and root health
Pruning
  • Mow regularly at 5–7 cm height if grown as a lawn companion to prevent seeding
  • Trim back overgrown mats in late autumn to maintain a neat ground cover
  • Remove excess growth to reduce competition with desired lawn grasses or garden plants
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no reported toxic reactions

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: Nitrogen-fixing cover crop, low-growing lawn ground cover, forage for grazing livestock