Sweet grass (Hierochloe odorata) was recently shown to contain substances as effective as DEET. https://en.wikipedia.org/wiki/Hierochloe_odorata https://en.wik

Sweet grass (Hierochloe odorata) was recently shown to contain substances as effective as DEET. https://en.wikipedia.org/wiki/Hierochloe_odorata https://en.wikipedia.org/wiki/Hierochloe_odorata