Denver Daisy black-eyed Susan produces large, three- to four-inch flowers with bright buttercup-yellow petals brushed with burgundy-mahogany near the dark central cone, blooming profusely from early summer straight through to frost. Vigorous and heat-tolerant, this award-winning cultivar performs well in borders, containers, and cutting gardens, and its long bloom season provides season-long colour with minimal deadheading required. It self-sows readily, often behaving as a short-lived perennial.