Beet, (Beta vulgaris), also called beetrootcommon beet, or garden beet, one of the four cultivated forms of the plant Beta vulgaris of the amaranth family (Amaranthaceae), grown for its edible leaves and taproot. Beets are most extensively grown in temperate to cool regions or during the cooler seasons. They grow best in deep loose soils that are high in organic matter and can tolerate a relatively high salt content of the soil but are sensitive to high acidity and to a low content of boron.