Rock Cap Moss is a low-growing moss that has a rich emerald color and spreads over rocks, logs, and bare stony places. It blankets those areas with a soft green covering that smooths harsh edges and produces a tranquil feeling in the garden. The moss is perfect for edging water features and providing textural contrast with boulders, driftwood, and outdoor statuary. It works well for gardeners seeking to create a soothing Japanese garden effect in which the feathery moss complements the sturdiness of pathways, walls, and dry ditches. Rock Cap Moss is hardy in Zones 4 to 9. It grows up to 8 inches in height and spreads about 24 inches. Depending on conditions, it reaches its mature size in 1 to 2 years. The moss will grow most rapidly in shade with lots of moisture. It can tolerate some sun, as long as the ground remains moist, and it grows in a variety of soil types, including sand and clay. Loamy soil is best because it matches the conditions found in its native forest environment. This moss works wonderfully for gardeners who want to have a lush green carpet in the shade where grass won't grow. Unlike grass, moss needs no mowing and stays green all year. Although it looks soft and frilly, this is a resilient plant that will survive unfavorable conditions such as heat, cold, and low rainfall by going dormant and then springing back to life when conditions improve. Care of Rock Cap Moss is easy. Nearby grass may invade its growing space, so occasional weeding may be needed. Unsightly fallen leaves and other debris should be removed to keep the the moss layer green and pristine and to prevent decaying matter from smothering young sprigs. Rock Cap Moss is a beautiful, low-maintenance solution for shady spots in the garden.