Coreopsis grandiflora 'Mayfield Giant' (large-flowered tickseed 'Mayfield Giant') — perennial

Overview

Coreopsis grandiflora 'Mayfield Giant' is a perennial in the genus Coreopsis, part of the Asteraceae family. Coreopsis grandiflora 'Mayfield Giant' grows best in full sun, and tolerates well-drained soils. Its UK hardiness is rated H7. Suggested uses include borders, containers and cut flowers. It is native to Maine, Missouri, Pennsylvania, South Carolina, Kansas, New Mexico, Oklahoma and Georgia.

About

Coreopsis grandiflora 'Mayfield Giant' is a perennial in the Asteraceae prized for its notably large yellow flowerheads. It flowers in the UK from June to September and prefers full sun with well-drained soil and moderate moisture. Fully hardy (H7), it is suited to borders, containers and for cutting.

Wikipedia contributors, CC BY-SA 4.0 — Coreopsis grandiflora

About the genus

Coreopsis is a genus of flowering plants in the family Asteraceae. Common names include calliopsis and tickseed, a name shared with various other plants.

Wikipedia contributors, "Coreopsis", CC BY-SA 4.0 — Coreopsis

In the garden

Coreopsis grandiflora 'Mayfield Giant' is a North American perennial in the Asteraceae grown for its large, yellow ray-and-disc flowers. The species has origins in several eastern and central US states; the cultivar retains the open, summer-flowering habit of the species and is produced for garden planting rather than wild sites. In the UK it reliably flowers from June to September. Plant this cultivar in a sunny, well-drained position and avoid waterlogged ground; it prefers moderate soil moisture rather than constantly wet soils. The hardiness rating H7 indicates the plant is fully hardy and will tolerate typical UK winter conditions without special protection. Position in full sun to maximise flower production and plant at a spacing that allows air to move between clumps to reduce the risk of summer leaf wetness. Use 'Mayfield Giant' in mixed herbaceous borders, in large containers on a sun-facing patio, or as a source of summer cut flowers. The sizeable flowerheads make it effective where clear, long-lasting summer colour is required, and stems are suitable for cutting to bring blooms indoors. Because the flowers are produced over several months, harvesting stems regularly will help maintain a continuous display through to September.

Growing conditions

Best soil and position for Coreopsis

Sunlight: full sun
Soil type: well-drained
Soil moisture: moderate
UK hardiness: H7

Plant details

Coreopsis grandiflora 'Mayfield Giant' size, habit and characteristics

Plant type: perennial
Suggested uses: borders, containers, cut flowers
Native to: Maine, Missouri, Pennsylvania, South Carolina, Kansas, New Mexico, Oklahoma, Georgia

Care notes

Pruning and caring for Coreopsis grandiflora 'Mayfield Giant'

Cultivation: Prefers well-drained soil and full sun. Deadhead to prolong flowering.
Pruning: Cut back after flowering to encourage bushiness and a second bloom.
Propagation: seed, division

Frequently asked questions

How do I grow Coreopsis grandiflora 'Mayfield Giant'?

Prefers well-drained soil and full sun. Deadhead to prolong flowering.

Where is the best place to plant Coreopsis grandiflora 'Mayfield Giant'?

Coreopsis grandiflora 'Mayfield Giant' prefers full sun.

What soil does Coreopsis grandiflora 'Mayfield Giant' need?

Coreopsis grandiflora 'Mayfield Giant' grows best in well-drained soil. Aim for soil that stays moderate.

How do I prune Coreopsis grandiflora 'Mayfield Giant'?

Cut back after flowering to encourage bushiness and a second bloom.

Is Coreopsis grandiflora 'Mayfield Giant' hardy in the UK?

Coreopsis grandiflora 'Mayfield Giant' has an RHS hardiness rating of H7, meaning it is fully hardy throughout the UK, tolerating temperatures below -20°C.

How do I propagate Coreopsis grandiflora 'Mayfield Giant'?

Seed, division.

More in the Coreopsis genus

Browse all Coreopsis →