Sagina

Irish moss is prostrate evergreen perennial. It is a flowering plant that thrives in morning sun to partial shade. The common name Irish moss refers to plants with emerald-green foliage.  Both species make dense, compact mats of ground-hugging foliage spreading to a foot or more wide and just 1-2 inches tall. Tiny star-shaped flowers are produced beginning in late spring and appear sporadically throughout the growing season. Use Irish moss where a very low, fine-textured carpet of green is desired, such as around stepping stones, between flagstones, or at the edges of a path as they tolerate light foot traffic. These plants can be a good ground cover near the edges of water features or in rock gardens. Use Irish moss for contrast in smaller containers or to simulate a lawn in miniature or fairy gardens. Water evenly but don't keep wet. Irish moss plants have few pests, but slugs can damage the plants.