The outer edge of civilization
Stinging Nettles. I've never tried them but here's some info
If you’ve ever accidently grazed against a stinging nettle (Urtica dioica) with your bare skin, you’ll know it. You’ll first feel a stinging sensation, quick and sharp, and then your skin will start to blister. The accompanying pain and itch can last for days. This is all thanks to the hollow...