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I understand. Yes, such variations of the plants would indicate real "farming" as opposed to gardening wild plants. I'm going to be visiting at the Glenn Black museum soon, and although their area of interest is the Mississippian site at Angel Mounds, they have done work at Hopewell sites as well. Perhaps someone there can point me to some information of this.
I believe that some researchers point to the abandonment of the large Mississippian sites (and eventually that tradition) was due to health problems associated with a corn based diet. I believe pellagra had been pointed to as a probably "diet caused" disease that might have led to a move from more exclusive farming and back to farming / hunting & gathering. I'll try to find some more information.
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