I am in Zone 5 but on the boarder of a zone 4... Bruce County Ontario..........
and if this tulip tree could survive the brutal winter the last 2 winters.........it is can survive anywhere........
they are using the genes and hopefully be able to plant them out in the wild here ..........they are not native to this area at all......but a species of Ontario.........so they are hoping the little ones make it just fine like the Mom........
they needed to find the oldest tree they could in Bruce to try this and this county is huge.......