"Soil" has a broad definition, and the terms potting soil and potting mix are being used interchangeably. Few contain actual dirt-type soil. ... -Miracle Gro Moisture Control Potting Mix.

This year, as a science experiment, I'm using three kinds of potting soil. In order of preference: Miracle-Gro's moisture control mix, Ecoscraps, and generic off-brand potting mix.