Building organic garden soil is the same as working the soil for any other kind of garden except for one thing: you must feed the soil with OMRI Listed products for organic gardening. The ground below your feet is not just dirt but a whole living breathing universe unto itself. Within those soil mineral particles are populations of microscopic bacteria, fungi, yeasts, protozoa and algae. They are collectively known as microbes, which feed on the remnants of dead plants, also known as organic matter. Organic gardens depend on high microbe populations to make plants grow strong naturally, resist pests and diseases, and produce a bumper crop of food or flowers.