Photo by Melody

PlantFiles: Stiff Sunflower
Helianthus pauciflorus

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Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Helianthus (hee-lee-AN-thus) (Info)
Species: pauciflorus (PAW-ki-flor-us) (Info)

Synonym:Helianthus pauciflorus subsp. pauciflorus

Category:
Perennials

Height:
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

Spacing:
Unknown - Tell us

Hardiness:
USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)

Sun Exposure:
Full Sun

Danger:
N/A

Bloom Color:
Bright Yellow
Brown/Bronze

Bloom Time:
Mid Summer
Late Summer/Early Fall

Foliage:
Herbaceous

Other details:
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Non-patented

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From herbaceous stem cuttings
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors
Direct sow as soon as the ground can be worked
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds
Properly cleaned, seed can be successfully stored

Click thumbnail
to view:

By KSBaptisia
Thumbnail #1 of Helianthus pauciflorus by KSBaptisia

By KSBaptisia
Thumbnail #2 of Helianthus pauciflorus by KSBaptisia

By KSBaptisia
Thumbnail #3 of Helianthus pauciflorus by KSBaptisia

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive KSBaptisia On Aug 15, 2008, KSBaptisia from Beatrice, NE (Zone 5b) wrote:

A beautiful (another common name is Showy Sunflower) native perennial sunflower. Spreads by rhizomes and by self seeding. Probably too aggressive for a traditional flower bed or even a small prairie garden. Great in a large meadow type planting, though.

Regional...

This plant has been said to grow in the following regions:

Beatrice, Nebraska
Prosser, Nebraska



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