Irish Moss (Sagina procumbens)

Irish Moss

Sagina procumbens

Delicate mat-forming groundcover, tiny white blooms dot its bright green carpet. Common names: Irish Moss, Pearlwort.

Partial sun
1–2/week
Beginner
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Plant Needs

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Sunlight Bright indirect to partial direct sun; tolerates light shade, avoid intense midday summer sun
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Watering Keep soil consistently moist but not waterlogged; prevent complete drying of root zone
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Temperature Thrives in cool to temperate conditions; protect from extreme heat above 28°C
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Characteristics

  • Leaf: Tiny, linear, bright green leaves densely packed along trailing stems
  • Flower: Small, white, 4-petaled blooms held just above foliage
  • Stem: Slender, creeping stems that root at nodes to spread and form continuous mats
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Care Guide

Watering

Keep soil evenly moist; water when top 1 cm of soil dries

Fertilization

Diluted balanced feed once every 6 weeks. Avoid over-fertilizing to prevent foliage burn and excessive growth

Eggshell powder topdressing:Grind dried eggshells to fine powder; sprinkle lightly on soil surface and water in to release nutrients gradually without root burn
Pruning
  • Trim back overgrown mats in late spring to maintain compact, neat form
  • Remove brown or dead foliage to improve airflow and encourage new growth
  • Gently rake dense patches to thin overcrowded areas and promote even coverage
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic to cats; no reported toxicity

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: Groundcover for rock gardens, pathway edges, or terrariums; mild-climate erosion control