Photo by Melody

PlantFiles: Giant Sunflower
Helianthus giganteus

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Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Helianthus (hee-lee-AN-thus) (Info)
Species: giganteus (jy-GAN-tee-us) (Info)

Synonym:Helianthus alienus
Synonym:Helianthus borealis
Synonym:Helianthus subtuberosus
Synonym:Helianthus validus

3 vendors have this plant for sale.

7 members have or want this plant for trade.

Category:
Edible Fruits and Nuts
Perennials

Height:
36-48 in. (90-120 cm)

Spacing:
12-15 in. (30-38 cm)

Hardiness:
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)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Full Sun

Danger:
N/A

Bloom Color:
Gold (Yellow-Orange)
Bright Yellow

Bloom Time:
Mid Summer

Foliage:
Herbaceous

Other details:
This plant is attractive to bees, butterflies and/or birds
Requires consistently moist soil; do not let dry out between waterings

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 the rootball
From softwood cuttings
From seed; direct sow outdoors in fall

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds
Remove fleshy coating on seeds before storing
Properly cleaned, seed can be successfully stored

Click thumbnail
to view:

By paracelsus
Thumbnail #1 of Helianthus giganteus by paracelsus

By scirpidiella
Thumbnail #2 of Helianthus giganteus by scirpidiella

By scirpidiella
Thumbnail #3 of Helianthus giganteus by scirpidiella

Profile:

1 positive
No neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive paracelsus On Jan 25, 2008, paracelsus from Elmira, NY (Zone 6a) wrote:

A very handsome perennial native plant that flowers the first year from seed. Airy, kind of like coreopsis.

Regional...

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

Palm Harbor, Florida
Valdosta, Georgia
Croton On Hudson, New York
Bend, Oregon
Houston, Texas
Farmington, Utah
Puyallup, Washington



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