Helenium autumnale (Sneezeweed)
This attractive native wildflower, with bright yellow blooms that look like the pinking shears happened by one day, is one of my favorites. It's ideally suited for the tamed, as well as the wild, garden, borders, and by stream beds where it blooms in late summer through early fall. It prefers rich, moist soil, so beware of drought and avoid over fertilizing. It's not necessary, but it can be cut back in June to reduce height and encourage branching and also more flowers, but it should be cut back after blooming and divided every three or four years. Full sun in Zones 3-8. Quarts.
Helenium flexuosum (Purple Headed Sneezeweed)
Helenium flexuosum, native to the eastern half of North America, won't make you sneeze, but its color and form just may make you swoon. Purple Headed Sneezeweed grows from two to three feet tall (cutting back in early summer will make a more compact plant and will produce more flowers), with bright yellow, drooping flower petals around a central purple/brown disk. It makes perfect cut flowers, and birds and butterflies are drawn to it, too. Full sun to part shade, Zones 5-9. Quarts