Do you have any indigenous peoples in your area?
(Not being flippant, or snarky)
In my area of the Sonoran desert we have a seed bank and organization dedicated to methods used by a number of different groups native to the area.
Discussion
Great question. I actually went to the Tribal Center some years ago asking questions about indigenous plants. I got the feeling that for at least the people I was talking to, that part of their cultural knowledge is significantly diminished if not gone. I might try a different reservation.