Irish Moss (Sagina subulata)

Irish Moss

Sagina subulata

Dense, moss-like foliage carpets the ground like emerald velvet. Low-growing evergreen perennial; common names: Irish Moss, Scotch Moss.

Full sun
2–3/week
Beginner
🌱

Plant Needs

☀️
Sunlight Prefers full sun to bright indirect light; partial shade is tolerated, but full sun enhances foliage vibrancy
💧
Watering Keep soil consistently moist but not waterlogged; avoid allowing the root zone to dry out completely
🌡️
Temperature Hardy to -15°C; thrives in cool to temperate conditions, avoid prolonged heat above 28°C
🔍

Characteristics

  • Leaf: Tiny, linear, bright green, moss-like leaves forming dense, uniform mats
  • Flower: Small, star-shaped white flowers with five delicate petals, held slightly above foliage
  • Stem: Slender, creeping stems that root at nodes to spread horizontally and form continuous coverage
🛠️

Care Guide

Watering

Keep soil evenly moist; water when the top 1 cm of soil feels dry

Fertilization

Diluted balanced liquid feed once monthly. Use a low-nitrogen feed to prevent excessive foliage growth that disrupts mat density

Eggshell powder top dressing:Crush dried eggshells into fine powder, sprinkle lightly over the soil surface; avoid direct contact with foliage to prevent potential burning
Pruning
  • Trim back overgrown patches in early spring to maintain a compact, uniform mat
  • Remove spent flower stems promptly to tidy the plant’s appearance
  • Thin dense mats occasionally to improve airflow and reduce fungal disease risk
⚠️

Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxic effects on humans

📖

Garden Uses & Culture

Culture: N/A

Usage: Ground cover for rock gardens, filler between stepping stones, and container edging