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.
Spring-planted oats are used for green manure, while fall-planted oats provide winter-killed ground cover. The residue is incorporated before the early planting of vegetables. Oats are particularly useful in rotations with vegetable crops because they grow quickly and are easily killed.