The frilly, double, bright yellow flowers of Double Trouble sneezeweed (Helenium 'Double Trouble') are the first of known doubles in the genus. Each petal on the daisy-like flowers has three notches at the tip and droops downward from the bottom of a globular disc. An extended flowering season—from mid-July through October—is the result of the plant being unable to produce viable seed. Strong, winged stems make 'Double Trouble' a great selection for the cutting garden as well as the landscape. All told, they last about two months. In spite of its common name, this species, also known as Helen's flower, is not known to cause sneezing or allergies.