Otherwise known as peat moss
Sphagnum comes from bogs in Canada, and it's usually over 90% organic.. And it's real aerated, eh? It's a bit light weight, so usually bark or sand is added to avoid the "topple factor", the technical term for when your plant tips over. When it's wet, sphagnum absorbs water, but when it dries out, it can actually repel water, which is the kiss of death. Peat must always be mixed with wetting agents, and is usually mixed with some of the items listed below.