Lemon-yellow, cup-like flowers open late spring through early summer from red buds on a stalwart, shrubby perennial. It's native to the sunny meadows of the Eastern U.S. Wonderful in a naturalistic garden or for dependably brightening a border. And, if you have them in your neck of the woods, they attract sphinx moths!
Mature size: 18-24 inches tall & wide; spreads via seeds
Minimum temperature: -30° F