Polynesian Colonisation Fueled by Sweet Potato: New Archaeological Evidence - Medievalists.net
Briefly

Archaeological findings in New Zealand reveal that the American sweet potato was cultivated by Māori as early as AD 1290-1385, marking significant agricultural innovation.
The research indicates that not only were kūmara cultivated extensively by Māori, but they may have been among the earliest crops introduced to Polynesia, challenging existing theories.
Read at Medievalists.net
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