Outsidepride Irish Moss Ground Cover Plant Seed - 5000 Seeds Irish moss seed, also known as pearlwort, grows best in full sun or partial shade Sagina Subulata is the Latin name for Irish moss plants. This low growing groundcover will get tiny white blooms on it during the summer months. One of the few groundcovers which is frequently used as a lawn alternative or substitute. It is also great to plant in-between stepping stones. Keep sagina subulata seeds continually moist until germination and plant in USDA Zones 4 - 10. This low growing ground cover will only get 2 - 3 inches tall. This is the most popular ground cover plant seed Outsidepride sells. Sow 5000 seeds to cover 100 SF and starting growing your own plants.