Coreopsis grandiflora
Coreopsis grandiflora is a clump‑forming perennial valued for deep yellow 2 to 3 inch daisies on upright stems. Plants bloom from early to mid‑summer and can rebloom with deadheading. They prefer full sun and well‑drained soils and are widely hardy across North America. This species is often short‑lived, so division or replanting keeps plantings fresh. Avoid winter‑wet soils that can cause crown rot.
At‑a‑glance
- Group/Class: species; perennial
- Height × spread: 18-30 in (45-75 cm) × 12-18 in (30-45 cm)
- Bloom window: June to August (longer with deadheading)
- Color & flower form: deep yellow, single daisies about 2-3 in wide
- Fragrance: 0 none
- USDA hardiness: zones 4-9
- Breeder / Year / Origin: unknown; native to the southeastern United States
- Pet safety: safe
How it differs
- Larger individual blooms than many Coreopsis species.
- Clump‑forming habit rather than spreading rhizomes.
- Often short‑lived compared with threadleaf types.
- Best flower size in lean, well‑drained soils.
Strengths
- Showy early‑summer color.
- Responds to deadheading with repeat bloom.
- Good pollinator support.
- Adaptable to many garden soils if drainage is good.
Care in one minute
- Site: full sun for stout stems.
- Soil and pH: well‑drained loam or sandy loam; neutral to slightly acidic.
- Watering: regular moisture in establishment; moderate thereafter.
- Feeding: light feeding only; excess nitrogen causes flopping.
- Grooming: deadhead to extend bloom; shear lightly after peak flush.
- Overwintering: ensure sharp drainage; avoid mulches that trap winter wet.
Watch‑outs
- Can be short‑lived; plan to divide or replant.
- Crown rot possible in winter‑wet or heavy clay.
- May flop in rich soil or shade.
Best uses (tags)
borders; cutting; pollinators; naturalizing
Provenance note
Native to the southeastern United States; widely selected into many garden forms since the 20th century.
References
- Missouri Botanical Garden Plant Finder – Coreopsis grandiflora
- NC State Extension Plant Toolbox – Coreopsis grandiflora
- Kew POWO – Coreopsis grandiflora Hogg ex Sweet
- ASPCA – Coreopsis (Tickseed) non‑toxic to pets
Written by: Your Flowers Guide editorial team
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