Zagreb Threadleaf Tickseed is a compact clumping perennial with narrow palmate deep green foliage. Its bright yellow daisy-like flowers with untoothed petals and darker yellow disks bloom from late spring into summer. Prompt deadheading can prevent spread and encourage additional bloom in fall. Prefers full sun and dry to medium well-drained soil. Drought, humidity, and road salt tolerance. Zagreb will spread aggressively in moist soils. Type: Perennial Origins: Southeast N. America; GA Native Height: 1' - 1.5' Spread: 1’ - 1.5' Spacing: 1’ USDA Hardiness Zone: 3 - 9 Culture: Full Sun, Part Sun Bloom Color: Yellow Season of Interest: Spring, Summer, Fall MAINTENANCE NEEDS: Low Maintenance. Can be an aggressive self-seeder- deadhead in spring to encourage extended bloom and prevent spreading. Crown rot may occur in moist, poorly-drained soils. Foliage decline may occur in hot summers if the soil is allowed to dry out. Snails and slugs can be a problem. LANDSCAPE USES: Accents or Group Plantings, Borders, Woodland Gardens, Naturalized Areas, Rock Gardens, Foundational Plantings, and Containers. COMPANION PLANTS: Switch Grass, Coneflower, Avens IMAGES: Photo by Leonora (Ellie) Enking, Coreopsis verticillata 'Zagreb', (2) photoset by Andrey Zharkikh, (1) 2012.08.20_18.19.22_CIMG1212, (2) 2012.08.20_18.19.00_CIMG1211, (3) photoset by F. D. Richards, Coreopsis verticillata 'Zagreb', 2015 (1)+(2) *As plants have ranges in appearance they may not appear as the images shown.
