Every few years I decide to get back into Dahlias for the explosion of color they provide at the end of summer, and for a few years I'll be good about digging and storing them. Then inevitably will come a fall when I just don't get around to digging them. This was the case last year, but to my surprise and delight, most survived the winter in the ground! They're considered hardy to zone 8, but I thought last winter was pretty cold and totally didn't expect to see any Dahlias return.
Evan, Montauk Daisies sound like a plant I need! I've never seen them grown before, do you know if they tolerate humidity?
Polly, I've been growing Brugs for about 7 years now- so that should tell you they're easy! LOL Plenty of water and fertilizer and they're happy. Mine get tossed into an unheated room for winter, where I give them a little water once a month or so.
Oh, just thought of another late blooming perennial, Monk's Hood. I had no idea when I planted it that they bloomed so late, mine typically starts blooming in August or September.