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 large variety of cover crops, and choosing one for your vegetable garden depends on several factors. See Table 1 for examples of cover crops that can be useful in home gardens. Cover crops and green manures can be planted before vegetables are planted, after harvest, in place of a vegetable crop, or in a fallow area of a garden. Warm season cover crops (e.g., buckwheat) are planted in spring or summer, before or in place of a vegetable crop. They grow quickly in a garden, preventing weeds from establishing and protecting bare soil from water erosion and crusting.