"Organic material" as in organic chemistry as in compounds that form carbon-hydrogen bonds - stuff made up mostly of hydrogen, carbon, oxygen, nitrogen, and the

"Organic material" as in organic chemistry as in compounds that form carbon-hydrogen bonds - stuff made up mostly of hydrogen, carbon, oxygen, nitrogen, and the halogens. The correct term is heterotrophic but even that is a fuzzy distinction because many (if not most) plants require symbiotic bacterial/fungi colonies due to nitrogen depletion and there are plenty of parasitic plants that can't produce their own nutrition. Clean classification of such abstract groups after billions of years of evolution is impossible.