North American Fruit Explorers mailing list at ibiblio

[marvin strand <strandmarvin@yahoo.com>]

Sam Brungardt referred St. Lawrence Nursery  as a source for pears trees for 
zone 4. SLN pear trees are on Pyrus Communis root stock and they say that 
they are hardy to -50 below, that puts them in zone 1.  Edible Forest Nursery 
list some of the same pear trees on Winter Nellis which they say is a 
improver Pyrus Communis root stock and are hardy in zone 3. This is very 
confusing to me.  Can someone explain why it appears to be a considerable 
difference between sln and efn as I would also like to order pear trees for 
zone 3b   Marv.    3b    Mt.