Sulfur acts as a soil conditioner and helps reduce the sodium content of soils. Sulfur in plants is a component of some vitamins and is important in helping give flavor to mustard, onions and garlic. In plants, sulfur is essential for nitrogen-fixing nodules on legumes, and necessary in the formation of chlorophyll. Plants use sulfur in the processes of producing proteins, amino acids, enzymes and vitamins. Sulfur also helps the plant's resistance to disease, aids in growth, and in seed formation.