Bigflower Coreopsis, Largeflowered Tickseed, Tickseed Coreopsis 'Tetra Giants'

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: Tetra Giants



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are good for cutting

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

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Suitable for growing in containers


24-36 in. (60-90 cm)


9-12 in. (22-30 cm)


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

Sun to Partial Shade



Bloom Color:

Bright Yellow

Bloom Time:

Mid Spring

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall




Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

By dividing the rootball

From seed; direct sow outdoors in fall

From seed; winter sow in vented containers, coldframe or unheated greenhouse

Direct sow as soon as the ground can be worked

From seed; sow indoors before last frost

From seed; direct sow after last frost

From seed; germinate in a damp paper towel

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds


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

Saint Joseph, Missouri

Buffalo, New York

Elba, New York

Candler, North Carolina

Cary, North Carolina

Greensboro, North Carolina

Burleson, Texas

Fort Worth, Texas (3 reports)

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Gardeners' Notes:


On Jun 23, 2015, DavidLMo from St Joseph, MO wrote:

If you like Coreopsis and large flowers, this is the one for you. Grows three plus feet high and the flowers are 3 - 4 inches across.

Unlike some Coreopsis (e.g. Lance Leafed), the plants support each other and are not floppy. Hate stakiing or ringing plants.:-(.

Quite impressive. Will reseed, but not invasively. A good thing since this last winter clobbered all my existing plants. Seeds planted in early Spring will bloom first year.

Highly recommended.