Giant Coreopsis (Coreopsis gigantea)

Giant Coreopsis

Giant Coreopsis is a woody, succulent perennial that is found in coastal areas of western North America and cultivated by nurseries. It is highly drought-tolerant, but susceptible to frost. A member of the sunflower family, it is covered in yellow blooms in the spring and summer. Giant Coreopsis grows up to 1.2 m tall.

Scientific classification

Species

Giant Coreopsis (Coreopsis gigantea)

Asters bellflowers fanflowers and allies

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Perennial

Lifespan

Herb

Plant Type

Spring, Summer

Bloom Time

91 cm to 1.8 m

Plant Height

60 cm

Spread

Green

Leaf Color

5 cm to 8 cm

Flower Size

Yellow, Blue

Flower Color

Green, Blue

Stem Color

Images of Giant Coreopsis

Distribution of Giant Coreopsis

Distribution Map

Giant Coreopsis is native to the subtropical western coast of North America. While it originates from this region, giant Coreopsis has also been introduced and cultivated in temperate areas globally, thriving in diverse environments beyond its native range.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Rocky sea cliffs & exposed dunes to 150 ft

Hemisphere Trend Curve

Northern

Sorthern

Culture

Symbolism

Always cheerful

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Quickly Identify Giant Coreopsis

Thick, woody trunk reaching 3-6 feet (91-183 cm) provides strong structural support.

Stout gray-brown stem, 2-4 inches (5-10 cm) thick, stands out prominently.

Bright green, deeply lobed pinnatifid leaves emerge in winter, distinctive foliage.

Large showy yellow daisy-like flowers, 3 inches (7.6 cm) across, bloom late winter to late spring.

Sculptural stems post-foliage adds unique visual interest in the landscape.

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Care Guide for Giant Coreopsis

Every week

Water

Full sun

Sunlight

20 - 38 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Giant Coreopsis, native to California's arid regions, shows excellent drought tolerance, requiring weekly watering to maintain health without soil saturation. Thriving in coastal environments, it prefers well-draining soils and withstands salt spray, making it ideal for seaside gardens.

Fertilize: Giant Coreopsis benefits from low nitrogen, high phosphorus fertilizers for blooming and root growth. Fertilize in early spring with a balanced, slow-release formula every 2-3 months, adjusting for growth stages. Monitor giant Coreopsis's response to feeding to ensure optimal health and vibrant flowers while avoiding root burn.

Pruning: Prune giant Coreopsis from late winter to early spring, removing dead stems and shaping the canopy for sunlight. This promotes robust flowering and prevents legginess. Cut above leaf nodes for vigorous growth and enhance air circulation to reduce disease. Use sterilized tools for best results.

Propagation: Giant Coreopsis is a perennial with tall yellow daisy-like blooms. Propagate through division in the active growth phase, ensuring each section has ample roots and shoots. Replant in well-draining soil with adequate spacing, and water consistently to encourage strong root development while avoiding sogginess.

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