Pure Earth Mineral Super-Boost is a 100% natural soil additive that restores the earth with trace minerals lost over time to erosion, wind and glaciation. Mineral Super-Boost is easily spead over the soil and/or tilled into the soil in spring and fall to produce big, healthy vegetables. Also great for urban farmers looking to replenish the soil in rooftop and squarefoot gardens. You will love the results of Pure Earth Mineral Super-Boost.