I like this approach to potting plants:
I used rotted wood chips to make potting soil in my old nursery and found that it worked wonderfully. Watching this video really made me nostalgic. I miss growing and selling plants.
You can often get free mulch from tree companies. Pile it up and let it rot. A year or two later, it’s rich and filled with earthworms. He’s using it quicker than that, but for a potting mix I might wait until it breaks down well. I also added rabbit manure to my mixes when I had it. That was like a slow-release fertilizer.
Thanks to PermieFlix for drawing my attention this video. If you’re not reading his site, I recommend you check it out. He finds a lot of very good permaculture videos.