A frenulum (or frenum) is a small fold of tissue that prevents an organ in the body from moving too far.
Cover crops usually are grown to prevent soil loss from wind and water erosion. Use fast-growing cover crops, such as winter wheat or annual rye, on fall-spaded gardens. A second, and probably more important reason home gardeners should use cover crops is to improve soil structure and increase organic matter.
It will also grow in soil, however, and is commonly used as a ground cover in place of grass. Dicranum thrives in the shade. It is a rich medium green and requires little care once established. Moss Acres: Types of Moss.