North American Fruit Explorers mailing list at ibiblio

["Jim Fruth" <jimfruth@charter.net>]

   A professor at the University of Alaska - Fairbanks told me that Pin 
Cherry trees, Prunus pennsylvanica L., that grow there were imported from 
the lower 48.  That area typically gets -40 F in Winter.  A former NAFEXer 
in that area grows them and claims that they bear fruit every year.
   I have Pin Cherry trees, here in Pequot Lakes, Minnesota, where the 
temperature rarely dips that low and my trees bear fruit only once or twice 
in ten years.  So what is the possibility that Pin Cherry requires bitterly 
cold weather to bear fruit?  Anyone have an idea???

Jim Fruth