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.
Annual and perennial grasses used as cover crops include various small grains (barley, oats, rye, triticale, and wheat), annual ryegrass, sorghum-sudangrass, perennial ryegrass, fine fescues, and tall fescue.