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.
In the Fall, sow the following cover crops to turn into the soil in Spring: Alfalfa, Austrian Field Pea, White Clover, Alsike Clover, Crimson Clover, Red Clover, Purple Vetch, Hairy Vetch, Woolly Vetch, Common Vetch, Fava Beans, Wheat, Oats, Cereal Rye, Winter Rape, and Lupines.