Okay, there's hardy and there's hardy.....Alpinia japonica

We have stands of this plant growing within 10 feet of this stump but none of those plants ever flower. The only plant that flowers is this one sunk down below ground level in this rotten stump. It flowers every year. In its evergreen form, this ginger is generally considered a zone 8a plant, though it can go a bit cooler, obviously, as a die back perennial.