See It This premium potting soil from FoxFarm is a well-balanced blend of sphagnum peat moss, sandy loam, and forest humus (composted bark and other plant matter) to create a rich mix that’s ...

Soil organisms, like earthworms ... resulting in a layer of decaying leaves giving a rich humus. The deep roots of these trees reached down to the 'B' horizon, unlike with coniferous trees ...