Now we’re getting into the really fascinating part of tree biology — the hidden underground universe known as the Soil Food Web. At first, the name sounds like something pulled from a graduate-level science textbook, but the idea is actually pretty simple: Healthy soil is alive. Very alive. Beneath every healthy tree exists an entire underground ecosystem made up of roots, fungi, bacteria, insects, earthworms, protozoa, mites, water, oxygen, minerals, and countless microscopi