How-to Guide
How to Grow Coreopsis
The short answer
Coreopsis (Coreopsis grandiflora, tickseed) grows in USDA zones 4a-9b in full sun — it tolerates partial shade — and well-drained soil, preferring sandy or rocky ground and tolerating dry conditions. NC State Extension describes showy bright-yellow flowers from late spring to late summer on clump-forming plants 1-3 feet tall and wide, with essentially no significant pest or disease problems.
Two habits keep it going: deadhead spent flowers to prolong the blooming season, and accept some self-seeding, because large-flower tickseed 'may not always be reliably perennial but will reseed itself in the garden.' Divide clumps in early spring when you want more plants or to refresh an aging one.
Sun, soil, and water
Plant coreopsis in a sunny spot; it accepts partial shade (2-6 hours of direct sun) with somewhat reduced bloom. Well-drained soil is essential — sandy or rocky soils are ideal, clay works only if it drains well, and the plant handles dry soil once established. Soil pH from acid to neutral (roughly 6.0-8.0) is fine.
When and how to plant
Set out plants or make divisions in early spring, spacing 1-3 feet apart for the mature clump. Coreopsis also self-seeds in the garden, so once you have an established patch, spring volunteers can be moved where you want them — the cheapest insurance for a species that can be short-lived.
Deadheading and season care
Deadhead the spent flowers to prolong the blooming season — with regular deadheading the late-spring flush stretches deep into summer. Late in the season, stop deadheading and let some heads mature seed if you want the planting to replace itself.
→ NC State Extension notes large-flower tickseed may not always be reliably perennial. If a clump vanishes after a hard winter, that is the species, not your gardening — plan on self-sown seedlings or division to keep the patch going.
Dividing
Divide in early spring: lift the clump, split it into pieces with shoots and roots, and replant at the same depth in well-drained soil. Division both multiplies plants and rejuvenates older clumps that have begun to die out in the center.
Common problems
- No significant insect or disease problems in NC State Extension's assessment; Southern blight is an occasional issue.
- Nontoxic to cats, dogs, and horses.
- Short lifespan is the main complaint — manage it with reseeding and spring division.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- North Carolina Extension Gardener Plant Toolbox — Coreopsis grandiflora (Tickseed) — Zones 4a-9b; sunny site, tolerates part shade; well-drained sandy/rocky soil, dry-tolerant; late spring to late summer bloom; deadhead to prolong bloom; divide early spring; self-seeds; may not be reliably perennial; no significant problems; non-toxic to pets