Earth medicine is an Organic Microbial Fertilizer. Our product is full of rich microbial life that supports and brings balance to your soil. As a microbial fertilizer it is safe (and encouraged) to use on plants throughout the winter months. Unlike synthetic fertilizers, Earth Medicine feeds the soil which the plant draws nutrients from daily, making it safe and effective to use all year round. We recommend using Earth Medicine once a month in your potted plants. The product is organic, shelf-stable and lab tested.