Waiting for inspiration ... waiting ... still waiting ...
The "parent plant pages" might be a good place for comments like "this grows well here".
Hmm ... how many people really know what regions are good for what plants? It seems to me that would take experience growing in several different climates, or academic knowledge.
All I ever know is that I can or can't grow something, that it thrives or doesn't. When it does poorly, I assume that I did something wrong. If it grows well, either I'm a genius or it's easy to grow.
I guess when a plant or "parent plant" has accumulated a long list of many peoples' experience, someone could work at finding patterns.
But I agree that it's hard to know from a state name or a ZIP code just what their climate is like. It would be a huge effort to try to cross-index ZIP codes or counties with Sunset or Koppen climate zones ...
>> Waiting for inspiration ... waiting ... still waiting ...
Hmmm ... we have some regional forums ... and some forums devoted to certain types of plants ...
Maybe start threads in regional forums asking "what is hard or easy to grow where you live?".
And start threads in 'plant forums' asking "who finds these easy to grow, who finds it difficult, and what are the problems in YOUR climate?"
Hopefully some of those people will know the key factors like "summers are too hot" or "springs are too unsettled".