Dictionary of Flowers: Coreopsis Verticillata (Thread Leaf Coreopsis)
Coreopsis Verticillata is a classic yellow bloom. Image used under a Creative Commons licence with the kind permission of majadumat and Flickr
- Coreopsis Verticillata
- Common name: thread leaf coreopsis
- Family: Asteraceae
- Category: Perennial in USDA zones 3-10
- Height: 16” to 24”
- Width: 15” to 18”
- Sun/part shade
- Blooms: early summer to fall
- Attracts: bees, butterflies, birds
- Growth habit: clumping. Used as a filler in containers
- Maintenance: easy
- Soil: poor to average, free draining. Water regularly if grown in containers
- Garden uses: containers, mixed border, mass planting
- Diseases: fungal diseases
- Pests: slugs and snails
Thread leaf coreopsis is a species of coreopsis native to North America.
The foliage is fine, thread-like and lacy. Yellow daisy-like flowers appear on wiry stems in clusters.
The flower color ranges from light buttery yellow to bright yellow. Some new varieties blooms are pink or reddish burgundy.
It blooms heavily during mid to late summer and into fall.
It's a great plant for areas with dry, poor soils.
Threadleaf coreopsis spreads by rhizomes. It does well in average to poor soils, even rocky or sandy. Perfect drainage is necessary to avoid fungal problems and root rot.
When established, it can handle drought. It prefers full sun to a part sun position. It tends to reach and sprawl if not enough sun is provided or if grown in too rich or wet soils.
It doesn't require fertilization when grown in average garden soil or in containers.
Deadhead for continuous bloom, and shear plant after the first flush of bloom in summer to force it to bloom heavily again in fall.
Divide the rootball every three to five years to propagate. Dig the plant out, divide the clump into sections and replant immediately. It doesn't require fall care. In spring, cut damaged foliage back.
Close-up of a Coreopsis flower. Image used under a Creative Commons licence with the kind permission of Rob Weir and Flickr
To propagate from seed, plant indoors in late winter. Plant seeds on moist starting mix and keep at 55 to 60F.
After they sprout, water as needed. Harden off before planting outside in their permanent position.
Seed can be wintersown or sown in place outside after the last spring frost in colder zones or in fall, in warmer zones.
It's hard to look at Coreopsis Verticillata without smiling. Image used under a Creative Commons licence with the kind permission of velvetelevator and Flickr
Basal cuttings can be taken in spring and rooted in moist loose medium using rooting hormone for best results.
Theadleaf coreopsis isn't prone to diseases or pest attacks. If grown in too wet soils with poor drainage, it can develop root rot or mildew. Slugs and snails can attack the plant. Bait as needed.
- Coreopsis verticillata 'Moonbeam' - light yellow flowers, two feet tall.
- Coreopsis verticillata 'Zagreb' - dark yellow flowers, shorter than other varieties
- Coreopsis verticillata 'Red Satin' - red flowers, eighteen inches tall
- Coreopsis verticillata 'Rosea' - pink flowers, spreads well. Sixteen inches tall
- Coreopsis verticillata 'Route 66' - tall variety, up to almost thirty inches. Yellow blooms and red mottled petals with a red center
Greenish-yellow variety. Image used under a Creative Commons licence with the kind permission of Tom Barta and Flickr
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Perennials For Containers
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