A soil medium kept alive by biology (bacteria, fungi, protozoa, worm castings, pre-inoculated biochar) rather than by chemical inputs. The key to keeping living soil alive is growing plants in it continually.
Jeremy contrasts living soil with hydro throughout this episode to explain why flushing is a hydro-only concept. In living soil the plant stops demanding nutrients on its own accord when it begins senescing.
Discussed in: Ep 001 · Ep 003 · Ep 007 · Ep 008 · Ep 025 · Ep 037