Species

Coreopsis grandifloraLarge-flowered Tickseed

19 other cultivars

perennialN. America Native

Mayfield Giant Tickseed

Coreopsis grandiflora 'Mayfield Giant'

The Story

Plant Bio

Coreopsis grandiflora is a clump-forming perennial featuring bright, daisy-like yellow flowers on slender stems. Its foliage consists of lance-shaped, green leaves, some of which may be lobed at the base.

This cultivar is distinguished by its exceptionally large, vibrant yellow flowers and vigorous growth, making it an excellent choice for bold, colorful borders and mass planting.

Uses & Benefits:

Bright yellow flowers add cheerful color to garden borders and wildflower meadows.

Drought-tolerant and low-maintenance, ideal for water-wise gardens.

Attracts pollinators like bees and butterflies, supporting local ecosystems.

SpeciesCoreopsis grandifloraLarge-flowered Tickseed

Essentials

At a Glance

Plant Type

Perennial

Height

30 inches

Width

21 inches

Light

Full Sun

Zones

4, 5, 6, 7, 8, 9

Water

Low to moderate

Humidity

Average

Lifespan

Short-lived perennial

Native To

Southeastern and Central USA

Toxicity

Non-toxic to humans and pets

Planting

How to Grow

Tuck seeds into well-draining soil in early spring.
Water lightly until germination occurs, about 2 weeks.
Apply a balanced fertilizer monthly during active growth.
Deadhead spent flowers to promote more blooms.
Divide every 3 years in early spring or fall.
Mulch around plants to conserve moisture and suppress weeds.

Pro Tip

Ensure soil drains well; avoid overwatering to prevent root rot.

Keep It Thriving

Care Guide

Do

Water during dry spells 🌱
Deadhead regularly to encourage continuous flowering 🌱
Apply fertilizer in spring and mid-summer 🌱
Divide every 3 years to maintain vigor 🌱

Don't

Overwater, which can cause root rot ❌
Ignore deadheading, leading to fewer blooms ❌
Plant in poorly-draining soil ❌
Neglect dividing, which can lead to overcrowding ❌

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Fertilize
Harvest
Prune
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Bright, sunny border with cheerful yellow flowersWildflower meadow accent

Companion Plants

EchinaceaLavender SalviaRussian sage Coreopsis verticillata

Multiply

Propagation Methods

Good to Know

Common Questions

Mayfield Giant Tickseed questions

What zones can Mayfield Giant Tickseed grow in?

Mayfield Giant Tickseed is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Mayfield Giant Tickseed deer resistant?

Yes — Mayfield Giant Tickseed is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Mayfield Giant Tickseed bloom?

Mayfield Giant Tickseed typically blooms in late spring to mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Mayfield Giant Tickseed need full sun?

Mayfield Giant Tickseed does best in full sun (6+ hours).

Is Mayfield Giant Tickseed drought tolerant?

Yes — once established (usually after the first full season), Mayfield Giant Tickseed handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.