Helenium blooms from late summer to September (August to November according to some sources) and, they say, it can rebloom.
In the mixed perennial border in the Butchart Sunken Garden, Helenium looked gorgeous, blended with other late-blooming plants and grasses.
Helenium is not difficult to grow. It loves full sun, fertile soil, can tolerate some moisture (another name of it is swamp sunflower).
USDA zones 3 - 10.
P.S. Some sources say that Helenium autumnale L.(bitterweed, common sneezeweed, false sunflower) can be weedy or invasive.
***Copyright 2012 TatyanaS