The OP didn't state where he/she lives. I would kill for the ability to grow Asians here, I've tried a few times with the hardiest varieties and with the hybrids Rossenyanka and Nikita's
Gift, but always end up losing them to winter kill. I have to content myself with my Meader, which is an awesome variety, and the only one that has done well long term. I had previously Ruby and Garretson growing and fruiting, and even lost both of those above the ground level to a particularly harsh winter back in the 1990s. I do have two small
trees of Prok started, although both have only been in the ground one winter, hopefully they'll also be hardy, as they were developed by NY State at Geneva, IIRC.