The Coreopsis verticillata is native to eastern half of North America. The Coreopsis verticillata is a member of the aster or sunflower family (Asteraceae or Compositae).
The genus name comes from the Greek where koris means bug and opsis means like. This refers to the shape of the seeds which resemble a bug or tick. This is why plants in the genus Coreopsis are also commonly called tickseed.
Most Coreopsis species are annuals or short lived. Mainly the C. verticillata is hardy and long lived. New species and cultivars are constantly introduced and some are long lived.
The common name for Coreopsis verticillata is thread leaf coreopsis or whorled tickseed.
The thread leaf coreopsis is very easy to grow. It prefers a sunny location with well-drained soil and rather dry than moist. The Coreopsis verticillata tolerates some salt.
The stems die in the winter and re-emerge in spring. You can cut or pull away the dead stems to make room for the new stems. The flower are star shaped and golden yellow and they attract bees, bumblebees and butterflies.
Thread leaf coreopsis grows in bushy clumps and spreads relatively fast with rhizomes. If you want to keep it in the same place you may want to put a plastic rim around it. The outer stems will fall to the ground so that it takes up quite a large space.
The Coreopsis verticillata is easy to multiply by dividing the clump. It also self-seeds.
Characteristic: newly emerging every year
Exposure: sun/ part shade
Foliage colour: green
Flower colour: yellow
Flowering time: June - September
Hardiness: -25 ºC/ -13 ºF
Height: 20 inches/ 50 cm