A frenulum (or frenum) is a small fold of tissue that prevents an organ in the body from moving too far.
Others, such as buckwheat, are very frost-tender. The cover crops listed here are widely adapted and can be grown in most areas of the United States, either as a summer or winter cover crop, depending on where you live. Rye This crop comes in two different types: annual rye and cereal rye. Both have their advantages.
A fallow crop is a crop that you plant usually in the summer/fall and let it there to act as a green manure for the soil. You can harvest top growth for forage or feed but the vines and roots help build the soil tilth. If you leave the entire plant would then technically be called a cover crop, I think.