or...it started ............and went thatta way..
Apparently, the people who built Gobekli Tepi (in a region of what is now Turkey) were farming a wild grain that was perhaps the earliest wheat plant. Perhaps, when that culture expired, for whatever reason, and the survivors migrated eastward they took the grain knowledge with them into the fertile crescent. Just sayin ...
Someone had a good idea about planting and growing food and other hunter-gatherers passing through copied it. In a few short years the idea spread. Looking back to us it would appear to happen all over at ounce.