Certified organic fertilizers are derived from naturally occurring materials, and boast minimal, and/or “chemical free” processing. They typically feed the soil biota, which digests such materials, only to release it in a more plant available (ionic) form. The term organic is a bit nebulous, and numerous definitions currently exist. Given this, the phrase “certified organic” means something slightly different to the various organizations issuing such stamps of approval. In other words, OMRI, OIM, and USDA listings may differ significantly. On the other hand, such certifications certainly point in desirable directions, and make wonderful starting points for the research of enlightened cultivators.