Earth Right Super Stuff® contains “good” bacteria – “microbes” – which are required in all healthy soils. We find these same types of microbes in all lush surroundings, such as in tropical forests. These microbes make nutrients more usable for the plants and grasses, aid in reducing toxic chemicals in the soil and aid in boosting the plants ability to resist diseases. We recommend at least 1 spring and 1 fall application. If you have concerns re: chemicals apply 2-7 days after using any herbicide, fungicide, or insecticide to protect and restore soil microbes.