Black Eyed Susan (Rudbeckia hirta) is a very nice perennial wildflower that is both cold and drought hardy, and it is a host plant for a wide variety of pollinator insects.
These are sold as dormant root crowns with a bit of stalk attached, bare root.
Photo credit: Krzysztof Ziarnek, Kenraiz, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons