The most hardy citrus is the ornamental Flying Dragon Citrus, which produces fruit, but the fruit is poor tasting. But can be grown in zone 6 Niagara Falls htt

The most hardy citrus is the ornamental Flying Dragon Citrus, which produces fruit, but the fruit is poor tasting. But can be grown in zone 6 Niagara Falls http://www.eattheweeds.com/hardy-orange/ http://www.eattheweeds.com/hardy-orange/ https://en.wikipedia.org/wiki/Cold-hardy_citrus https://en.wikipedia.org/wiki/Cold-hardy_citrus The most tropical fruit that can be grown in cold climates in North America is the Paw Paw. (Survives -30 degrees) "It belongs to the genus Asimina in the same plant family (the Annonaceae) as the custard-apple, cherimoya, sweetsop, ylang-ylang and soursop."