Common Haircap Moss
Polytrichum commune
Also listed as Pogonatum madagassum, Polytrichum alticaule
Also known as Common Haircap
Climate Match for your location
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Common Haircap Moss is a non-vascular moss that forms dense, upright cushions or mats in damp, shaded areas. It thrives in acidic soils and moist conditions, making it ideal for woodland gardens, rock gardens, and areas where traditional plants struggle.
Why grow it
Common Haircap Moss establishes more reliably than many moss species in acidic, poorly drained soils where vascular plants often fail. Its dense, upright growth habit provides year-round ground coverage and soil stabilization with minimal maintenance once established, making it a practical choice for woodland restoration or shaded areas with compacted earth. Unlike some delicate moss species, Polytrichum commune tolerates moderate disturbance and variable moisture, though it grows more vigorously in consistently moist conditions.
Watch out for
Moss establishment requires patience; colonies may take one to two seasons to fill in visibly. Direct, intense sunlight or prolonged dry spells can cause dormancy or die-back, so site selection matters more than ongoing intervention. Avoid fertilizers and pH-raising amendments, which favor competing vascular plants and algae over moss growth.
Overview
- Form
- Growth Rate
- Size
- Dormancy
- Family
- Polytrichaceae
Native to the United States
Native Range
Widespread in temperate regions worldwide
Native to: New Jersey, New York
Seasonality
Season of Interest
Ground cover
Low spreading plants that carpet the soil.
Succession Role
Tolerances & Soil
Establishment & Care
- Establishment
- Maintenance
- Propagation
Common Haircap Moss is a non-vascular moss that forms dense, upright cushions or mats in damp, shaded areas. It thrives in acidic soils and moist conditions, making it ideal for woodland gardens, rock gardens, and areas where traditional plants struggle.
Climate Match for your location
See how well Common Haircap Moss grows in your area.
Enter your ZIP code and we'll show you how this plant fits your local climate.
Why grow it
Common Haircap Moss establishes more reliably than many moss species in acidic, poorly drained soils where vascular plants often fail. Its dense, upright growth habit provides year-round ground coverage and soil stabilization with minimal maintenance once established, making it a practical choice for woodland restoration or shaded areas with compacted earth. Unlike some delicate moss species, Polytrichum commune tolerates moderate disturbance and variable moisture, though it grows more vigorously in consistently moist conditions.
Watch out for
Moss establishment requires patience; colonies may take one to two seasons to fill in visibly. Direct, intense sunlight or prolonged dry spells can cause dormancy or die-back, so site selection matters more than ongoing intervention. Avoid fertilizers and pH-raising amendments, which favor competing vascular plants and algae over moss growth.
Overview
- Form
- Growth Rate
- Size
- Dormancy
- Family
- Polytrichaceae
Native to the United States
Native Range
Widespread in temperate regions worldwide
Native to: New Jersey, New York
Seasonality
Season of Interest
Ground cover
Low spreading plants that carpet the soil.
Succession Role
Tolerances & Soil
Establishment & Care
- Establishment
- Maintenance
- Propagation
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