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Bigflower Coreopsis, Largeflowered Tickseed, Tickseed Coreopsis
Coreopsis grandiflora 'Rising Sun'

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




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:

Bright Yellow

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:

Unknown - Tell us

Seed Collecting:

Unknown - Tell us


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

Athens, Illinois

Pinconning, Michigan

Saginaw, Michigan

Port Washington, New York

Richfield, Ohio

Oklahoma City, Oklahoma

Bend, Oregon

Portland, Oregon

Knoxville, Tennessee

Petersburg, West Virginia

Milwaukee, Wisconsin

show all

Gardeners' Notes:


On Oct 31, 2010, kdfisher from Ellijay, GA (Zone 7a) wrote:

Taken over by powdery mildew the first year bought through Lowes. Could be they are in a location that is blocked from breezes...poor air circulation. Waiting to see if they return in 2011.


On Jul 18, 2007, lola23 from Portland, OR wrote:

Coreopsis grows very well in my NW garden, even in clay soil. If you want to see blooms, though, you'll have to stay on top of dead-heading. As an added bonus, it's known to attract lady bugs.


On May 19, 2007, efbiosis from Oakland, CA (Zone 10a) wrote:

This is a great plant for the mid border. Covers itself with fully double, bicolor blooms in late spring. Needs periodic shearing of spent blooms to keep the flowers coming; not affected by powdery mildew.

June 2007 edit: Some powdery mildew is blooming on interior leaves. Seems to respond well to systemic treatments. Butterflies love this plant and you'll need to dead head frequently as flowers will close quickly and begin to set seed.