The microbes in Green Spade Probiotic Fertilizer contains photosynthetic microbes that use energy from the sun to provide energy to feed the soil microbes in your garden. These soil microbes break down organic material in the garden every day into simpler compounds that plants use for growth, including sources of Carbon, Nitrogen and Phosphorous. When used on plants and soil, these microbes stabilize the soil and the energy and nutrient systems in the system, making your soil more fertile!