Virtually a myth.
They came, struggled and left.
https://www.sciencemag.org/news/2016/11/why-did-greenland-s-vikings-disappear
It looks like corn/barley production was weak, indoors and only during the warmer first years of Greenland habitation
they had to quickly resort to fishing and other means of staying alive before abandoning settlements, as the first link, above indicates
http://sciencenordic.com/vikings-grew-barley-greenland
None of this is any advertisment for sunny climes
