Flocculencio
Donor
Once again, the Polynesians are not very likely to bring potatoes across. And the maize they would bring across would probably be gained from the tropical areas of the Americas, and so unsuited for growth in cold areas like New Zealand. I don't know how fast the Maori could create a new cold-tolerant cultivar, and it's possible that they wouldn't consider it worth the effort and would just go to growing sweet potatoes like in OTL.
I know it isn't plausible. I was just considering the effects