Fay Zee Siu F1 hybird,emanating from to regions,Yunnan and Hainan Island far apart!"(The findings suggest that the evolutionary split between Litchi chinensis populations in Yunnan and Hainan could have occurred around 18,000 years ago)"Hainan Island is were I assumed they originated.Yunnan a lot more cold,must be some cold hardy,like Brewster lychee.