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Helianthus pauciflorus ssp. pauciflorus Nutt.
Synonyms: Helianthus rigidus, Helianthus laetiflorus var. rigidus
USDA Symbol: HEPAP2
USDA Native Status: Native to U.S.
Stiff sunflower is one of the most widely cultivated of the perennial sunflowers. Its 3-6 ft. stem is lined with dark-green foliage and it bears showy sunflowers on long flower stalks.
Plant CharacteristicsDuration: Perennial Habit: Herb Flower:
Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: Jul , Aug , Sep
AR , CT , GA , IA , IL , IN , KS , KY , MA , ME , MI , MN , MO , MT , ND , NE , NH , NJ , OK , RI , SD , TX , VA , VT , WI Canada: MB
, SK Native Distribution:
Ont. & MI to Sask., s. to LA, NE & CO; naturalized eastward Native Habitat:
Dry, upland prairies; plains USDA Native Status: L48(N), CAN(N)
Growing ConditionsLight Requirement: Sun
Soil Description: Various dry soils.
Conditions Comments: Not Available
Excellent germination occurs with seeds that have been refrigerated over winter. Stem
cuttings can be taken before flowering, but the easiest method of increase in to divide the clump in early spring. Seed Collection:
Nutlets usually mature 2-3 weeks after flowering. To beat finched to the seeds, secure a small bag around seeds heads after the flowers fade. Air-dry collected seed heads, separate nutlets from chaff, and store in sealed, refrigerated containers. Seed Treatment:
Not Available Commercially Avail:
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Record Modified: 2012-12-20
Research By: TWC Staff