If you want to convert an old orchard to a self-sustaining food forest, start with the SOIL. Billions of creatures can live in a single teaspoon, all connected by miles of fungal mycelium. It's an entire universe beneath our feet. Prepare to be amazed.
Grass, to me, is Orchard Enemy #1. I talk about how to get rid of it, how to turn an orchard into a food forest, and what to do to get your orchard ready for winter, thanks to tips from Michael Phillips' book, The Holistic Orchard.