Hi,
I am new to this forum and I realize this thread hasn't been updated in awhile but I thought I would add my two cents' worth. (After all I found it from google so others may be doing the same!) I'm in Edmonton, AB which is Zone 3a, so I almost feel your pain, although I imagine the difficulty I have in finding hardy perennials for z3 is probably multiplied many times for z2
I've only had my garden for a few years but I am in the process of trying to win a new section of it back from the weeds to develop an edible perennial garden. I also have lots of edible perennials growing elsewhere in my garden but I really want to focus on them for this new area (not as ambitious as it sounds - it's about 8 feet square)
I thought I might as well share my research, so here it is in a google doc if anyone is interested. I'm still working on it but the link will update automatically.
https://docs.google.com/document/d/1OozRn9EUAYyrKe7XMi5eKuPsvZJqf6tQBVIAFTWiuvE/edit?usp=sharing
If anyone has any other suggestions, I would be happy to hear them!
Take care
Jocelyn