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.
There are a few moss varieties that are especially popular for home cultivation. 1  Sheet moss is very easy to grow and can withstand foot traffic, making it an excellent choice for a lawn alternative or breakup between paving stones. 2  Ceratodon moss is also good between stones.