I'm not game enough to try it, but one year I had a customer try horehound leaves (supposed to use the root) and she said it numbed her mouth! Yikes!
I think I gathered seeds but one of those, out in the garden with nothing to put them in so I'm not quite sure WHERE I saved them, and I have a box full of that kind of seed. I think since I have the room, I'll just broadcast ALL the seeds and see what comes up! (Of course I did save my zinnias, celosia, etc in envelopes)