I haven’t tried anything rated for a Zone 5 minimum yet; I was thinking the Bartlett rootstock may have been a stretch when I planted them, but we’ve had so few losses so far I’m gaining some confidence. However, they’re been packed in over four feet of snow the last few winters, and we received such a heavy blanket of snow in early and mid-November the last couple years that we had either no or very little frost in the ground. The interwebs aren’t consistent on P. Betulifolia, some say Zone 5 and some say colder, and I’m trying some seedlings this year. Probably my gamble will be the cold-hardiest Asian pears I can find on either that or P. Ussuriensis rootstock.
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