Overview
Coreopsis grandiflora 'Sunburst' is a perennial in the genus Coreopsis, part of the Asteraceae family. Coreopsis grandiflora 'Sunburst' 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 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 'Sunburst' is a herbaceous perennial in the Asteraceae, native to parts of North America including Maine, Missouri, Pennsylvania, South Carolina, Kansas, New Mexico, Oklahoma and Georgia. In the UK it reliably flowers from June to September, providing a steady run of summer blooms that suit repeated cutting. Place 'Sunburst' in a sunny spot with well‑drained soil and moderate moisture; avoid waterlogged ground. Being fully hardy (H7) it tolerates typical UK winters without special protection, so plant at the front or middle of a sunny border or in containers sited on a sunny patio. The plant's growth habit and flowering period make it useful where a dependable summer display is needed. Use it where seasonal cut flowers are required: stems cut in the morning during the main June–September flowering will extend the display and provide vases of summer blooms. Combine with other full‑sun perennials that share well‑drained soil requirements to maintain continuity in the border, and rotate cutting to sustain flowering through the season.
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 'Sunburst' 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 'Sunburst'
- Cultivation
- Prefers full sun and well-drained soil. Deadhead to prolong flowering.
- Pruning
- Deadhead spent flowers to encourage continuous blooming.
- Propagation
- seed, division
Frequently asked questions
How do I grow Coreopsis grandiflora 'Sunburst'?
Prefers full sun and well-drained soil. Deadhead to prolong flowering.
Where is the best place to plant Coreopsis grandiflora 'Sunburst'?
Coreopsis grandiflora 'Sunburst' prefers full sun.
What soil does Coreopsis grandiflora 'Sunburst' need?
Coreopsis grandiflora 'Sunburst' grows best in well-drained soil. Aim for soil that stays moderate.
How do I prune Coreopsis grandiflora 'Sunburst'?
Deadhead spent flowers to encourage continuous blooming.
Is Coreopsis grandiflora 'Sunburst' hardy in the UK?
Coreopsis grandiflora 'Sunburst' 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 'Sunburst'?
Seed, division.
From the Fenn Plants journal
- Notes on DaffodilsWhen to plant daffodil bulbs in the UK, how deep, how to naturalise them in grass, why daffodils stop flowering (“blindness”), and why you should never mix cut daffodils with other flowers.
- Keeping Your NerveHow to garden through a heatwave — the best time to water, why deep soaks beat daily sprinkles, caring for pots and vulnerable plants, and why you can let the lawn go brown.
- Made to LastHow to clean, store and protect garden pots and planters — the frost-proof vs frost-resistant difference, winter care for terracotta and ceramic, and how to reuse a broken pot.
More in the Coreopsis genus
- Coreopsistickseed
- Coreopsis auriculata 'Superba'Lobed Tickseed
- Coreopsis grandifloralarge-flowered tickseed
- Coreopsis grandiflora 'Badengold'Large-Flowered Tickseed
- Coreopsis grandiflora 'Goldfink'Large-Flowered Tickseed
- Coreopsis grandiflora 'Mayfield Giant'large-flowered tickseed 'Mayfield Giant'
- Coreopsis grandiflora 'Mayfield Giants'Large-flowered Tickseed
- Coreopsis rosea Twinklebells Sunrise ('P16132')Pink Tickseed
