Chaffweed (Lysimachia minima)

Chaffweed

Lysimachia minima

Tiny, delicate blooms carpet damp soil like scattered starlight. Low-growing annual wildflower; common name: Chaffweed.

Partial sun
3–4/week
Beginner
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Plant Needs

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Sunlight Prefers partial shade to full shade; tolerates brief morning direct sun without leaf scorch
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Watering Keep soil consistently moist; avoid complete drying out, as the shallow root system cannot tolerate drought
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Temperature Thrives in cool to temperate conditions; avoid prolonged temperatures above 28°C which can cause rapid wilting
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Characteristics

  • Leaf: Opposite, oval to lanceolate, 2–5 mm long, bright green with smooth margins
  • Flower: Solitary, 2–3 mm wide, white or pale pink petals with yellow central stamens
  • Stem: Slender, creeping, freely branching to form dense, low mats
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Care Guide

Watering

Maintain constant soil moisture; mist surface if top 1 cm dries out

Fertilization

Diluted organic feed once every 2 weeks. Use low-nitrogen feed to promote flower production rather than foliage growth

Composted eggshell powder:Mix 1 tsp of finely ground eggshell powder into the top 1 cm of soil monthly to improve soil structure and boost calcium levels; avoid raw eggshells to prevent pest issues
Pruning
  • Remove spent flower heads to prevent unwanted self-seeding if desired
  • Trim back dead foliage after the plant completes its annual life cycle
  • Thin dense mats to improve airflow and reduce fungal growth in damp conditions
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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: Low-growing ground cover for damp garden areas; supports small pollinators like solitary bees