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 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.

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.