They are also used as an erosion-control groundcover, along the banks of watercourses, under flowing water, and on steep slopes. Moss lawns may be used to cover green roofs. Mosses reduce losses of soil moisture to evapotranspiration when saturated, mosses reduce water infiltration into soil. Moss also hosts symbiotic nitrogen-fixing bacteria, like clover, and when mosses are dried and wetted, they release nitrogen and carbon into the soil. A moss layer can act as a physical barrier to prevent germination of vascular plants. Moss lawns can be used as a living mulch they retain moisture, do not become compacted, and do not require annual replacement. They tend to be too moist to sit upon comfortably.
Moss lawns can therefore stand being walked on, but not being scuffed. Mosses are squishy and compress without being damaged, but they are easily torn by tension.
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