In not so distant times, there was a tradition of allowing one acre of your farmland to remain as a "devil's acre" so as to appease the local spirits. It was an acre left untouched, allowed to grow wild and undisturbed.
This, sadly, is no longer in practice. Modern agriculture tries to squeeze the land for every last gasp of "productivity," not considering the long term consequences of such a practice and how it ruins the soil, disrupts ecosystems, starves wildlife and pollinators in the fallow season...
The Devil's Acre
I devoted my entire back yard to the wild gods, land spirits, and pollinators. Every plant that cropped up was left to grow, no mowing allowed. The wild grasses and amaranth grew up to my shoulders.