The discovery of parts of the plant outside its native territory is also accepted evidence of domestication.
Two main methods of identifying wine making that are accepted by scholars are identifying domesticated stocks, and discovering grape processing evidence.
The main change incurred during the domestication process of grapes is that the domesticated forms have hermaphrodite flowers.
What that means is that the domesticate forms of the grape are able to self-pollinate.
Thus, the vintner can pick traits she likes and, as long as she keeps them all on the same hillside, she need not worry about cross-pollination gumming up the works.
The European grape was introduced into China in the second century BC, with other imports resulting from the Silk Road.