not just any dirt, i have a system for it, and it is not a lot, just for biome diversity. it's a process and ritual which occupies most of an entire day.

https://www.sciencedaily.com/releases/2011/06/110602162820.h...

here is an interesting interview about biome culture from a raw meat diet guy (not what i eat)

https://www.vice.com/en/article/nnqw3q/this-guy-has-eaten-no...