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The only ones of these that have survived here at least 3 years ( and -29 F) as branches on Siberian C trees are Madison, Reliance, and Redhaven. Encore, PF 1, PF7, PF 24 and Coral Star survived a winter or 2 but not the -29F. Starking Delicious, Summer Pearl, are young in testing and I haven't tried the others. I want to have another shot at Encore. None of these rootstocks except Bailey are hardy here, even as rootstocks under ground but I haven't tried Tenn Nat VF281.1, and Bailey as a rootstock causes late growth of the cultivar into the fall.
Dave
Central MN, z 4a
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