Coreopsis verticillata 'Zagreb' – Egg-Yolk Yellow Threadleaf Tickseed

Thread-Leaved Tickseed 'Zagreb' (Coreopsis verticillata 'Zagreb')

Coreopsis verticillata 'Zagreb' (kor-ee-OP-sis ver-tiss-ill-LAY-tah) produces star-like blossoms in egg-yolk yellow in early summer on plants 12 inches tall and wide. The sturdy, upright stems and finely textured foliage add delicate texture to the garden.

Noteworthy Characteristics

Looks good in drifts; site next to plants with contrasting foliage.

Growing Conditions & Care

Generally, grow coreopsis in well-drained soil in full sun or partial shade. Deadhead in midsummer to encourage rebloom and prevent self-sowing. Tolerant of a variety of soils. Thrives on poor soils and is tolerant of heat, humidity, and drought.

Propagation

Sow seed indoors in mid- to late winter at 55° to 61° F; divide in early spring.

Potential Problems

Slugs, snails, bacterial spot, rust, Botrytis flower blight, aster yellows, powdery mildew, downy mildew, and fungal spots.

Quick Reference

• Height/Spread: 1–3 ft.
• Light: Full sun to part shade
• Moisture: Dry to medium
• Maintenance: Moderate
• Bloom Time: Early summer to summer
• Flower Color: Yellow
• Uses: Beds, borders, ground covers, cottage gardens
• Type: Perennial
• Special: Drought tolerant