Photo by Melody

PlantFiles: Sunflower
Helianthus annuus 'Mammoth Grey Stripe'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Helianthus (hee-lee-AN-thus) (Info)
Species: annuus (AN-yoo-us) (Info)
Cultivar: Mammoth Grey Stripe

4 vendors have this plant for sale.

24 members have or want this plant for trade.


12-15 ft. (3.6-4.7 m)

24-36 in. (60-90 cm)

USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Full Sun


Bloom Color:
Bright Yellow

Bloom Time:
Mid Summer


Other details:
Unknown - Tell us

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:

Propagation Methods:
From seed; direct sow after last frost

Seed Collecting:
Collect seedhead/pod when flowers fade; allow to dry

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2 positives
1 neutral
No negatives

Gardeners' Notes:

Positive CurtisJones On Aug 20, 2008, CurtisJones from Longmont, CO wrote:

From your friends at Botanical Interests: This giant sunflower is an heirloom that has been grown in gardens since the late 1800's. The plants can reach 6'-10' tall with flowers as large as 12" across. The tree-like plants are excellent for an annual hedge or privacy screen, and the seeds make great snacks for birds or humans. To save the seeds for your own consumption, hang the mature flower heads in a cool, dry place for 3-4 weeks. Once established, these sunflowers tolerate both drought and poor soil. A fast-growing, fun variety for kids!

Positive garden_mom On Jul 5, 2007, garden_mom from Bigelow, AR wrote:

This sunflower is a kids' delight! They are very easy to grow and get very tall (ours were over 10') and have a thick stalk with a single huge flower head. The flower heads droop down and have a tendency to recurve as the seeds mature. The birds liked the smaller flowered sunflowers with tiny seeds much better than this brute, but the kids wouldn't trade if for any other.

Neutral QueenB On Nov 3, 2004, QueenB from Shepherd, TX (Zone 8b) wrote:

Given rich soil, lots of sun, and plenty of water, this sunflower will perform beautifully. The only drawback we've found is that the seeds have a slight fuzz, so they're not as pleasing to the tongue to eat!


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

Cedar Bluff, Alabama
Bigelow, Arkansas
Altadena, California
Lake San Marcos, California
Merced, California
Redwood City, California
Longmont, Colorado
Lutz, Florida
Effingham, Illinois
Calvert City, Kentucky
Cumberland, Maryland
Portland, Oregon
Brazoria, Texas
Shepherd, Texas

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