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Coreopsis, Bigflower Coreopsis, Largeflowered Tickseed 'Sunray'

Coreopsis grandiflora

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



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are good for cutting

This plant is attractive to bees, butterflies and/or birds

Flowers are fragrant

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Grow outdoors year-round

Suitable for growing in containers


18-24 in. (45-60 cm)


24-36 in. (60-90 cm)


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

Sun to Partial Shade



Bloom Color:

Gold (Yellow-Orange)

Bloom Time:

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall

Blooms repeatedly



Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

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


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

show all

Gardeners' Notes:


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.


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.


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.


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 !