Rudbeckia triloba (Brown-eyed Susan)
Rudbeckia triloba, also known as Brown-eyed Susan, is considered a biennial or a short-lived perennial, but like Foxgloves and some other flowers we know, once you have it, you will always have it because it freely reseeds. That being said, it is one of the showiest native flowers I can think of, and when in bloom, you can spot it a mile away. This clump-forming perennial grows to four feet (sometimes, but rarely, taller) and is smothered in hundreds - and I do mean hundreds - of small bright yellow cone flowers from July until frost. If it gets to be too much of a good thing for you, you can always deadhead to prevent so many seedlings (they're easy to pull up, though), but I gave up on that years ago and just decided to enjoy the spectacular late summer/fall display. Brown-eyed Susan is easy to please; it's a butterfly magnet; not only that, but it's also deer and drought tolerant. Full sun and moist, well-drained average soil. Zones 4-8. Quarts.