There are tons of wild hemp plants growing along railroad tracks in Missouri. I am told the seeds blew off trains when they used the hemp to make rope many years ago.
I had a buddy that had a brainstorm in college. He and another fella went out and picked two 55gal trashbags full of that crap and took the chance to pick it and bring it back to the frat house and dry it all out and package it. Only to piss off a bunch of his brothers and friends and have to give back all the cash he took in. Not to mention a few ass kickins when folks found out he was sellin ditch weed.
Andy