Lush, low-growing ground cover with mossy texture and tiny white blooms.
Seed Prep
Cold Stratification: Recommended. Place seeds on a damp paper towel inside a zip-lock bag. Refrigerate at 4°C (40°F) for 2–3 weeks.
Check Weekly: If any seeds sprout during stratification, remove and plant immediately.
When to Sow
Indoors: Start 6–8 weeks before last frost.
Outdoors: Sow in early spring or fall in mild climates for natural stratification.
Germination Conditions
Optimal Temp: 15–20°C (59–68°F)
Light Requirement: 12–16 hours/day – use grow lights if needed
Germination Time: Up to 35 days after stratification
Sowing Instructions
Depth: Gently press seeds onto moist soil — do not cover, light is required to germinate.
Soil: Use fine, well-draining seed-starting mix or sandy loam.
Watering: Mist gently to keep soil evenly moist without disturbing seeds.
Humidity: Use a humidity dome or clear cover to maintain consistent moisture during germination. Open the dome briefly once per day to allow fresh air in and reduce mold risk. Remove the dome entirely once seedlings emerge.
Post-Germination Care
Transplant: Once seedlings are sturdy and frost risk has passed.
Spacing: 10–15 cm (4–6 in) apart for solid coverage.
Light: Full sun to part shade.
Water: Keep moist while establishing; tolerates brief drought later.
Growing Tips
Avoid soggy conditions — Irish Moss prefers well-draining soil.
Great for borders, stepping stones, rock gardens, or containers.
Occasionally mow or trim for compact growth.
- Water regularly during dry spells, especially until well-established.
- Avoid overwatering; allow the top layer of soil to dry between waterings.
- Tolerates light foot traffic once established.