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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 (thread leaf) 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 $43.20
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8-18 Inches

Bloom Color

Golden Yellow

USDA Hardiness Zone 5-8

Whorled tickseed Interesting Notes

Easily grown in dry to medium wet, well-drained soil in full sun. Thrives in poor, sandy or rocky soils with good drainage. Tolerant of heat, humidity and drought. Prompt deadheading of spent flower stalks can be tedious for a large planting, but does tend to encourage additional bloom. Plants may be sheared 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. 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 inches 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. No serious insect or disease problems. Tends to sprawl, particularly if grown in moist and/or fertile soils. Crown rot may occur if grown in moist, poorly drained soils. Borders. Also effective in naturalized areas, wild gardens or cottage gardens. Good plant for areas with poor, dry soils. Kemper Center for Home Gardening

Coreopsis verticillata 'Zagreb' Growing and Maintenance Tips

Full sun to part shade in average to dry soils that are well drained. An extremely tolerant plant. Does well in poor rocky soils. Tolerant of humidity, heat, and dry conditions. Spreads by both rhizomes and seeds but is not obnoxiously invasive.

Key Characteristics & Attributes

Full Sun
Full Sun
Drought Tolerant
Drought Tolerant

Additional Information

Growth Rate
Season of Interest (Flowering)
Late Summer
Rock Garden
Native to Northeast
Native to US
Soil Moisture Needs
Propagation Type