Scientific Name: Coreopsis verticillata
Common Name: threadleaf coreopsis, whorled tickseed
Family Name: Asteraceae
Origin: U.S. - southwest
Hardiness Zone: Zone 4: (-34 to -29 °C)
Plant Type: Herbaceous perennial
Mature Size: 0.4 - 0.7m x 0.3 - 0.6m (height x width)
Habit: Dense, Spreading
Form: Mounded
Texture: Fine
Landscape Uses: Attract beneficial insects, Attract butterflies, Container planting, Cut flower or foliage, Ground cover, Group or mass planting, Perennial border, Summer interest
Exposure: Full sun
Soil or Media: Rocky or gravelly or dry, Well-drained
Leaves: Simple, Lobed, Dissected, Opposite, Soft flexible, Glabrous, Linear, Rhomboidal, Other, Incised, Pinnately lobed
Flowers: Head (capitulum), Yellow, Jun-Jul-Aug-Sep
Fruit: Cypsela (achene + calyx), Brown, Aug-Sep-Oct
Key ID Features:
Leaves opposite, fan-shaped in outline, most 3-5cm long x 4-6cm wide, 3-parted, with each leaflet deeply incised to form mostly 5 thread-like segments 1-2cm long x 1-2mm wide; flower heads up to 3-5cm wide, singly or cymose, ray florets 8, petal-like, golden yellow to creamy white (cvs.) with notched tips, disk florets yellow.