The Ironite Pennington Deep Green Lawn Mineral Supplement is a mineral supplement containing soluble iron. The granules help to give your plants and yard a quick greening when in need of a pick-me-up. The use of iron-based fertilizer is specially formulated to turn your yellow lawn fresh and green. These granules will give you exactly that- a deep green without excessive growth. For use on lawns, flowers shrubs, vegetables, and trees. Non-staining and non-burning formula that is safe to use in any season on any type of grass! Get your yard back to green!