The Helenium genus contains plants that are hardy perennial in nature.
Most garden varieties range between 60 and 120 cm, and have daisy like flowers of red, orange or yellow.
They come into bloom from the end of summer until the first frost. Some common names for members of Helenium include Yellow Star, Sneezeweed, and False Sunflower.
Common Names: Sneezeweed, False Sunflower, Rosilla, Yellow Star.
Life Cycle: Hardy perennial.
Height: 12 to 60 inches (30 to 150 cm).
Native: Northern and Central America.
Growing Region: Zones 3 to 9.
Sneezeweed, Yellow Star and other Helenium Plants can be grown outside from seed by sowing them at the start of autumn, or the start of spring.
Once the seed is sown, give it a light covering of topsoil.
They should be grown in a sunny area of the garden, ideally with a rich soil of PH 5.5 to 7.
If you prefer you can start Helenium plants off indoors first. Sow them about 10 weeks before they are due to be transplanted into the garden, before the last frost of spring.
They should take around one to two weeks to germinate at a temperature of 21 degrees Centigrade (70°F).
Once ready the seedlings should be transplanted about 40 cm (16 inches) apart (small species of Helenium) or 75 cm apart (30 inches; large species of Helenium).
Once growing in the garden, yellow Star, Sneezewort and other Helenium members should be pinched back in the spring to delay flowering until the autumn.
Following flowering, deadhead the plants to encourage further growth.
At the end of the blooming season, cut the plants back to the ground.
It is best to divide every four years to maintain healthy growth; division can also be used to create more plants in the spring.