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Coreopsis: How to Plant and Grow Coreopsis Flowers | The Old Farmer's Almanac

Coreopsis

Photo Credit
Pixabay
Botanical Name
Coreopsis spp.
Plant Type
Sun Exposure
Soil pH
Bloom Time
Flower Color
Hardiness Zone
Special Features
Subhead

How to Plant, Grow, and Care for Coreopsis Flowers

The Editors
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These long-blooming native flowers are a fan favorite. Countless small blooms sit atop thin, branching stems, making coreopsis suitable for planting in a number of areas around the garden. Here’s how to plant, grow, and care for coreopsis in your flower garden!

About Coreopsis

Coreopsis varieties produce daisy-like yellow, red, orange, pink, maroon, and violet flowers that bloom from summer to fall. Even as other summer flowers are fading in the fall, coreopsis are often still going strong.

Bees and butterflies love its nectar, and small birds (like goldfinches) love its seeds. It tolerates heat, humidity, and drought and, as cut flowers, will add cheer to any bouquet.

Plant in masses for striking visual effect; coreopsis are well-suited to beds, borders and containers. Varieties include annuals that tend to form clumps, be short lived, and self-sow; perennials, with rhizomatous roots; and hybrids that put energy into making colorful flowers and set few seeds. The annual varieties are often included in wildflower seed mixes. 

Planting

When to Plant Coreopsis

  • Sow seeds directly outdoors after the last spring frost or start seeds indoors 6 to 8 weeks before the last spring frost.
  • Plant young annual coreopsis plants outdoors in the spring. Perennial coreopsis plants can be planted anytime from spring through early fall. 

Choosing and Preparing a Planting Site

  • Coreopsis flowers do best in full sun, but they will grow and bloom (to a lesser extent) in partial sun as well.
  • Coreopsis tolerate poor soil, but not clay. They need well-draining soil. Add compost and/or sand to improve drainage before planting. 

How to Plant Coreopsis

  • Do not cover seeds; they need light for germination.
  • Keep indoor-started seeds warm and moist. 
  • Plant transplants 12 to 18 inches apart.
  • Water newly planted coreopsis regularly.  
Care

How to Care for Coreopsis

  • Water established plants during dry spells.  
  • Too much fertilizer may cause spindly plants. Apply 10-10-10 lightly in spring, if desired. 
  • Deadhead for continuous blooms, removing the spent flower and its stalk. 
  • In mid- to late summer, when flowers fade, shear off 1/4 to 1/2 of growth to encourage late-season reblooming.  
  • Leave the seed heads on the plants in the fall for the birds or cut stems back to 6 to 8 inches to protect the crowns. 
  • Annual varieties can be dug up and discarded in the fall after a few frosts. 
  • Divide perennial plants every 3 to 4 years in the spring or early fall. 

Pests/Diseases
Harvest/Storage

Coreopsis as Cut Flowers 

  • Cut fully opened flowers in the morning. 
  • Recut the stems at an angle and remove leaves from the bottom half of the stems before placing in a vase. 
  • Change the water completely every 3 days. 
  • Coreopsis will last 7 to 10 days in a vase. 
  • Coreopsis is an excellent cut flower in a mixed bouquet. 
Wit and Wisdom
  • The coreopsis’ common name, tickseed, comes from the fact that its seeds resemble tiny ticks. 
  • Similarly, the name “coreopsis” stems from Greek koris, for “bedbug,” and opsis, meaning “like,” because the seeds also look like little bed bugs.  
  • In the language of flowers, coreopsis means “always cheerful.” 
  • Coreopsis flowers and roots were traditionally steeped into teas by some early Native Americans. 
  • The flowers can be used to make yellow and red dyes.