Rooting hormones are not necessary, but may speed up the process. Essentially they give a little push to undifferentiated cells to become root cells.
The same thing happens with time if you cut and put into a proper thing, be that coco, a cloner, or a glass of water.
You can literally top a plant, stick that in the dirt, and most times that top will become a proper clone without doing anything to it. Everything else you do is just trying to speed up root growth. Since you want natural / organic, try sticking a cut into your prepped soil and keep it moist - I'll bet that is all you need.