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

See our complete Coreopsis Plant Guide for more in depth care details.

More About Coreopsis ‘Double the Sun’

Coreopsis ‘Double the Sun’ is one of those perennials that simply radiates happiness in the landscape. Its bright, fully double golden yellow blooms stand out immediately, delivering bold, saturated color that lasts for months. Unlike traditional single-flowered tickseed, the blooms on ‘Double the Sun’ are densely layered with petals, giving them a fuller, almost pom pom appearance that reads beautifully from across the garden. When planted in groups or drifts, the effect is especially eye catching and cheerful.

Flowering begins in late Spring and continues steadily through Summer, particularly if you give it a light deadheading now and then. The plant forms a tidy, upright clump of fine textured green foliage that stays clean and attractive even between bloom cycles. It thrives in heat and full sun, which makes it a strong performer in Southern gardens and other warm climates where dependable, long lasting color is essential.

Why We Like It (Our Trials)

In our Upstate SC testing ground, ‘Double the Sun’ has been one of the most consistent yellow perennials we grow. We planted it in one of our hottest full sun beds where the soil leans on the leaner side, and it never skipped a beat through Summer heat. While some older coreopsis varieties tend to thin out or sprawl by midseason, this one stayed upright and tidy, continuing to push strong blooms without constant attention. Even during stretches of dry weather, it held its color and structure remarkably well.

I remember one particularly hot July afternoon when several neighboring perennials were clearly stressed, yet ‘Double the Sun’ looked just as vibrant as it did in late Spring. A customers asked what that "bright yellow plant" was because it was the only thing still glowing in that bed. We didn't have any left in stock, and the customer was pretty upset. That kind of steady performance is exactly what we look for when selecting plants we feel confident recommending year after year.

Double the Sun vs. Other Coreopsis Varieties

Double the Sun reads fuller and more “garden mum-like” because of its double blooms when compared to Early Sunrise, a classic, bright daisy form that looks cleaner and more naturalistic. While Early Sunrise delivers a straightforward, open look, Double the Sun leans into dense, ruffled flower power and a more showy, planted-on-purpose presence. Against Moonbeam Coreopsis, the difference is even clearer—Moonbeam feels airy and fine-textured, while Double the Sun brings thicker visual weight and a more dramatic golden pom effect in beds and containers.

Set alongside Permathread™ Red Satin, Double the Sun stands out as a traditional sunny yellow statement, while Red Satin introduces deep contrast and a more modern color direction. Red Satin often feels lighter and more continuous in bloom, but Double the Sun commands attention with its bold, stop-and-stare double flowers. Next to Permathread™ Shades of Rose, Double the Sun is the stronger choice when warm, classic summer gold is the goal, rather than a softer, blended pink-rose palette with a boutique feel. Gardeners looking for big, ruffled, high-impact yellow blooms should choose Double the Sun.