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Plant Profile: Threadleaf Coreopsis (Coreopsis verticillata)

Threadleaf coreopsis is a rhizomatous herbaceous perennial and a member of the aster family, Asteraceae, that also includes daisy, sunflower, and lettuce.  It is native to southeastern US where it grows in open woodlands in full sun and on variable soil.   The dense bushy plants grow 1-3′ tall and have branched wiry stems with 2-3″ long  sessile leaves that are palmately divided into threadlike segments.  The  1-2″ wide flower heads are carried singly on slender stalks  in loose corymbs from late spring to fall and consist of yellow unnotched ray flowers surrounding yellow disc flowers. Deadhead prolongs bloom and shearing in late summer encourages a good fall display.   Due to its drought tolerance, long bloom time, disease and pest resistance, and long life, threadleaf coreopsis are very popular garden plants for borders, cottage gardens, and naturalized areas.  The genus name, Coreopsis, comes from the Greek words koris meaning bug and opsis meaning like/similar to and refers to the appearance of the seed.    The specific epithet, verticillata, is the Latin word for having whorls and refers to the arrangement of the leaves.  

Type: Herbaceous perennial

Bloom: One to two inch wide flower heads from late spring to fall consisting of yellow ray flowers surrounding yellow disc flowers

Size: 1-3′ H x 2-3′ W

Light:Full sun

Soil:Fertile to lean, medium moist to dry, well-drained

Hardiness: Zones  3-9

Care: Deadhead to promote flowering; shear in late summer for fall rebloom

Pests and Diseases: Generally healthy but susceptible to slug and snail damage, aphids, root rot,mildews, leaf spot, aster yellows, Botrytis blight

Propagation: Seed (species), division, cuttings

Companion Plants:Phlox, cranesbill, Salvia, blanket flower, purple coneflower

Outstanding Selections:

‘Golden Showers’ (18-24″ tall, 2.5″ bright yellow flowers)

 

‘Grandiflora’ (taller and with larger flowers than species)

‘Moonbeam’ (2′ tall, sulphur yellow flowers)

‘Zagreb’ (1-1.5′ tall, dark yellow flowers