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Smith, R.W.
Helianthus pauciflorus ssp. pauciflorus Nutt.
Stiff sunflower
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 Characteristics
Duration: Perennial Habit: Herb Flower:
Fruit: Size Class: 3-6 ft.
Bloom Information
Bloom Color: Yellow
Bloom Time: Jul , Aug , Sep
Distribution
USA: 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 ,
NS ,
ON ,
PE ,
QC ,
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 Conditions
Light Requirement: Sun
Soil Description: Various dry soils.
Conditions Comments: Not Available
Propagation
Description: 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: yes
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Metadata
Record Modified: 2012-12-20
Research By: TWC Staff
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