I ran across this website again today: http://practicalp...
It is similar to the Plants For A Future database, and I figured I'd share it, in case anybody else was already planning a few seasons ahead (also for the sexy photos of permie-favored plants like Oca, Siberian Pea Shrub, and Autumn Olive on the front page!). It's technically a wiki, which means that anybody can update it, but they need to provide source references. Keep in mind that any one source could be incorrect, so at least make sure there are multiple reference sources listed for something questionable, or you might want to find others.
It's important to be safe!