IRISH MOSS SEEDS, Sagina subulata, Heath Pearlwort, Perfect In Garden, Lawn Substitue or In-Between Stones, Groundcover Heath Pearlwort, Zones 4-10 - Quality Seeds By MS.CO (10000 Seeds) Sagina subulata (Heath Pearlwort or Irish Moss, syn. Sagina pilifera) In just eight weeks after germination, the Irish moss becomes thick and full. It occurs on dry sandy or gravelly soils Perfect In Garden, Lawn Substitue or In-Between Stones Mossy foliage grows just 1 - 2 inches tall