Ah yes, leaf mold, leaf mold soil! Nature's perfect life starter. When you read books like Teaming With Microbes, you'll learn that there's is almost every kind of microbe activity in LM, or LM soil, that layer of hummus right under the leaves.
Bacteria, fungi, ARCHEA!, protozoa all of them. In abundance too! As in billions per gram. All of the fundamental life builders all in one place, balanced, and it comes with nutrients!
You can harvest it in a forest (trees), or create it in your own yard! Nature does the rest.
It's a fundamental part of JADAM, which feels very permie to me. LMS can be the building block of all sorts of natural fertilizers and pesticides.
The Teaming With books are great sources for information, all of the JADAM books are worth a look too.
I love this topic!
And yes. We used these methods for medicinal cannabis in the Oklahoma market, along with living soil, cover crops, beneficial living things of all sorts including preying mantids, lady bugs. Lacewings, microbes etc. All preventative.