Good Dirt Plant Biotics contains a complex mixture of microbes essential to building and maintaining healthy, living soil. Think of it as yogurt for your plants. Plant fertilizer provides macronutrients that feed the plant while biotics are microorganisms that feed the soil. Healthy soil increases a plants immune system & ability to absorb nutrients while minimizing transplant shock & stimulating root development. Old soil? Purchase Good Dirt Plant Biotics to replace them & feed with Good Dirt Plant Food to feed them & make your soil living again!