Similarly, in the Pacific Northwest, patches of berries and other edible plants may be remnants of Indian/First Nation settlements:
https://www.science.org/content/article/pacific-northwest-s-...
https://www.science.org/content/article/pacific-northwest-s-...
We found an old foundation after digging around where there were forsythias growing in the woods on our place after being keyed into that one.
[1] https://www.npr.org/sections/thesalt/2016/08/29/491797791/th...