Botanical Name: Coreopsis grandiflora ‘Double the Sun’

Common Name: Tickseed

Hardiness Zone: Perennial in Most Climates (USDA Zones 4–9)

Size: 16–20" Tall × 14–18" Wide

Growth Habit: Upright, Clump-Forming Habit

Sunlight: Full Sun (Best Flowering)

Soil: Prefers Well-Drained Soil; Adapts to Average to Poor Soils

Water Needs: Low to Moderate; Drought Tolerant Once Established

Bloom Season: Late Spring through Summer (Often Reblooms)

Fertilizer: Minimal; Avoid Excess Feeding

Features: Fully Double Golden-Yellow Flowers, Long Bloom Season, Heat & Drought Tolerant, Deer Resistant, Pollinator Friendly

Uses: Ideal for Perennial Beds, Borders, Pollinator Gardens, Containers, and Cut Flowers

Patent: ❌ Not Patented

Propagation: ✔ Propagation Allowed

More About Coreopsis ‘Double the Sun’

Coreopsis ‘Double the Sun’ is a standout tickseed selection known for its bright, fully double golden-yellow blooms that bring bold, cheerful color to the garden for months on end. Unlike single-flowered coreopsis, the blooms on ‘Double the Sun’ are densely petaled, giving them a fuller, almost pom-pom-like appearance that reads especially well from a distance.

Flowering begins in late spring and continues steadily through summer, especially when spent blooms are lightly deadheaded. The foliage forms a neat, upright clump of fine-textured green leaves that stays attractive even between flushes of bloom. This variety thrives in heat and sun, making it a dependable performer in Southern gardens and other warm climates where long-lasting color is essential.

Why We Like It (Our Trials)

In our trials, ‘Double the Sun’ has proven to be exceptionally tough and dependable. It handles full sun, heat, and periods of dry weather without skipping a beat, and it doesn’t flop or sprawl like some older coreopsis varieties can. Once established, it requires very little care beyond occasional deadheading to keep it looking its best.

We especially appreciate how long it blooms compared to many other perennials. It bridges the gap between spring and late summer color beautifully and attracts a steady stream of pollinators without becoming a magnet for deer. For gardeners who want bold color with minimal maintenance, this one checks all the right boxes.

Coreopsis ‘Double the Sun’ vs. Other Coreopsis Varieties

Compared to single-flowered coreopsis varieties, ‘Double the Sun’ offers a much fuller, more refined bloom that feels intentional and polished in designed landscapes. The double flowers also tend to hold their visual impact longer, even as individual blooms age.

When compared to threadleaf coreopsis types, ‘Double the Sun’ has a more upright, substantial presence and works better as a focal plant in borders rather than a filler. It also tolerates heat and drought just as well, while delivering a bolder color punch. For gardeners looking for a long-blooming, sun-loving perennial with classic golden color and modern performance, Coreopsis ‘Double the Sun’ is an excellent choice.