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PlantFiles: Bigflower Coreopsis, Largeflowered Tickseed, Tickseed Coreopsis
Coreopsis grandiflora 'Sunray'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Coreopsis (kor-ee-OP-sis) (Info)
Species: grandiflora (gran-dih-FLOR-uh) (Info)
Cultivar: Sunray

4 vendors have this plant for sale.

6 members have or want this plant for trade.


18-24 in. (45-60 cm)

15-18 in. (38-45 cm)

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)
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)

Sun Exposure:
Full Sun


Bloom Color:
Gold (Yellow-Orange)

Bloom Time:
Mid Summer
Late Summer/Early Fall
Mid Fall
Blooms repeatedly


Other details:
Drought-tolerant; suitable for xeriscaping

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Unknown - Tell us

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There are a total of 9 photos.
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3 positives
1 neutral
No negatives

Gardeners' Notes:

Positive s_jones On Jun 28, 2009, s_jones from Aurora, CO (Zone 5a) wrote:

Vigorous and long-blooming, my Sunrays thrive in mild shade or full sun, and seem unbothered by the heat of river rock mulch that I now regret ever having installed. Continuous, repeat flowers provide months of entertainment for seed collectors.

However, the plants seem prone to diseases and pest problems; they withstand the assaults quite well, but their foliage do not escape unscathed. Consider this a tepid positive rating, unless you are good at identifying and heading off such problems in advance.

Neutral mcrousse On May 20, 2009, mcrousse from Holly Springs, NC (Zone 7b) wrote:

Easy plant from seed, and fast-growing its first year. Tall when in flower and very showy. However I have had trouble keeping this plant alive all summer, even with great dirt and good watering. About half of them do well and others don't. Could be that it doesn't like our humidity that well. Maybe someone else from the southeast can report.

Positive Jelaine On Apr 22, 2005, Jelaine from Chiloquin, OR wrote:

This is a beautiful plant which blooms all summer long in S. central Oregon, zone 5. The only problem is it is susceptible to cucumber beetles. Two years in a row my three plants have been devoured and almost destroyed.

Positive saya On Jan 6, 2003, saya from Heerlen
Netherlands (Zone 8b) wrote:

This is a fine blooming plant that flowers all summer special when you deadhead it or cut it a little back it goes on until frost comes. Very reliable !


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

Aurora, Colorado
Monroe, Georgia
Hebron, Kentucky
Pinconning, Michigan
Endicott, New York
Holly Springs, North Carolina
North Augusta, South Carolina
Gillett, Texas
Kalama, Washington
Olympia, Washington
Madison, Wisconsin
Oconomowoc, Wisconsin

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