Hi-Yield Iron Plus Soil Acidifier 11-0-0 is designed to help correct yellowing of plants and grass. It provides a great source of Nitrogen, Iron and Sulfur which are essential for growth and development of plants. It features fast-green formulation which helps turn yellow into green quickly. It also helps acidify the soil by lowering the pH level to improve soil condition and create a good environment to your plants. It will not burn plants if used carefully according to directions. It is ideal for use on lawns, trees, flowers, shrubs and citrus.