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Coreopsis verticillata 'Zagreb' (whorled tickseed)

Coreopsis verticillata 'Zagreb'

whorled tickseed

Winner of the 2001 RHS Award of Garden Merit, this threadleaf coreopsis is just a little bit shorter than 'Moonbeam'. 'Zagreb' has bright yellow flowers that sit atop tall, erect, lacey, somwhat mound forming, delicate (threadleaf) looking, green foliage that has an airy appearance. The flowers are abundant and bloom continuously throughout the entire summer. Removal of the dead blossoms encourages longer blooming and healthier flowers. Truly a colorful sight. Great in rock gardens and gardens with poor soil. Makes a good cut flower.

Coreopsis verticillata 'Zagreb' - 72 per flat Availability
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12-18 Inches


18-24 Inches


12-18 Inches

Bloom Color


USDA Hardiness Zone 5-8

whorled tickseed Interesting Notes

Threadleaf coreopsis (also commonly called whorled coreopsis) is a rhizomatous perennial which typically grows in dense, bushy clumps to 1-3' tall. 'Zagreb' is more compact (to 1.5' tall) and features bright yellow, daisy-like flowers (1-2" diameter) with untoothed rays and darker yellow center disks. Flowers appear singly in loose clusters (cymes) in a lengthy late spring to late summer bloom period which sometimes extends to first frost. Shearing plants in mid-summer (early August) when bloom usually tapers down will encourage a fall rebloom. Palmately 3-parted leaves with thread-like segments lend a fine-textured and airy appearance to the plant. Plants in the genus Coreopsis are sometimes commonly called tickseed in reference to the resemblance of the seeds to ticks. - Missouri Botanical Garden

Coreopsis verticillata 'Zagreb' Growing and Maintenance Tips

Easily grown in dry to medium moisture, well-drained soils in full sun. Thrives in poor, sandy or rocky soils with good drainage, but grows easily in any average, well-drained soils. Tolerant of heat, humidity and drought. Deadheading of spent flower stalks will encourage additional bloom - shear in mid to late summer to promote a fall rebloom and to remove any sprawling or unkempt foliage. 'Zagreb' can spread in the garden by rhizomes and self-seeding, particularly in moist, fertile soils.

Good Substitutions

tickseed Coreopsis 'Crème Brûlée'
tickseed Coreopsis 'Sienna Sunset'
threadleaf tickseed Coreopsis Permathread™ 'Red Satin'
whorled tickseed Coreopsis verticillata 'Moonbeam'

Key Characteristics & Attributes

Full Sun
Full Sun
Part Sun
Part Sun
Cut Flower
Cut Flower
Drought Tolerant
Drought Tolerant

Additional Information

Soil Moisture Needs
Plug Type
Horticultural Plug
Season of Interest (Flowering)
Late Summer
Green Infrastructure
Green Roof
Native to North America
Propagation Type