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.
House Plants. Purple shamrock (Oxalis triangularis) is a houseplant in cold winter areas. In USDA zones 6 through 10, it can grow outdoors in borders or edgings. Purple-leaved plants do best in light shade and moist soil. White or pinkish flowers contrast well with the dark leaves. Volcanic sorrel (Oxalis vulcanicola), hardy in zones 9 through 11, has several colorful-leaved cultivars.