In regards to cherries, i know the SK series are best, so that answer is easy. Apples arent too hard to choose from, but I would like to see what people suggest for a hardy apple tree for zone 2, and has multipurpose apples.

The problem for me is thinking of pears and plums. The russian types of pears have conflicting information for use and taste, and there are no euro types hardy to zone 2 that I can find. Her mother in law grows plums and pears but doesnt know what kind they are. Grafting of those could work, but I dont think they will try it.

Pembina is a reliable plum with sweet flesh and tart skin. Needs a pollinator though... Perfection plum makes a good pollinator with almost identical fruit.

Others will disagree, but I don't really recommend pears. I grow Ure and it is a nice tree with good fall colour and has small pears that taste just like a bartlett. But you need a pollinator, and what can anyone do with buckets of plums that ripen all at once? I eat maybe 10 each year and the rest just become a magnet for wasps and a mess on the lawn.