An exceptional cultivar of heliopsis that produces bright golden yellow, daisy-like flowers with a mahogany eye atop dark purple-red stems. The mature flowers are all-yellow, contrasting nicely against the green foliage with a purple-red tinge. This selection flowers for up to 8 weeks beginning in midsummer, especially if deadheaded.
'Summer Nights' has a tall, upright, clumping habit. The long flower stems are excellent for cutting.bHeliopsis is an excellent tall perennial for the back of the flower border. It has a bushy, well-branched form and glossy, deep green, triangular leaves. It's a real workhorse in the garden!