Large-flowered tickseed (coreopsis) Coreopsis grandiflora
Large-flowered tickseed (coreopsis) (Coreopsis grandiflora) is an evergreen perennial flowering plant in the Asteraceae family, native to Southeastern and central United States. It grows 40–90 cm (16–35 in) tall and 30–50 cm (12–20 in) wide, wants full sun and low water, and is hardy to about -32 °C (-26 °F). Space plants about 40 cm (16 in) apart.
Plan Large-flowered tickseed (coreopsis) in your garden →
Free. Draw your beds, then watch it grow through the year in 2D and 3D.
Large-flowered tickseed (coreopsis) at a glance
| Type | Perennial flowering plant, evergreen |
|---|---|
| Family | Asteraceae |
| Mature height | 40–90 cm (16–35 in) |
| Mature spread | 30–50 cm (12–20 in) |
| Spacing | 40 cm (16 in) centre to centre |
| Sun | Full sun, at least 6 h of direct sun a day |
| Water | Low; drought tolerance high, waterlogging tolerance none |
| Soil pH | 5.5–7.5 |
| Cold hardiness | About -32 °C (-26 °F) once established (roughly USDA zone 4) |
| Heat stress | Likely above about 35 °C (95 °F) |
| Flowering | from about June for 9–13 weeks (northern hemisphere; later in cold climates, earlier in warm ones) |
| Wind tolerance | Low |
| Pollinator value | High |
| Edible | Not grown as food |
| Native to | Southeastern and central United States |
| Common in gardens of | 🇺🇸 United States |
Is Large-flowered tickseed (coreopsis) toxic?
- People: not known to be toxic
- Cats: not known to be toxic
- Dogs: not known to be toxic
Not listed as toxic by ASPCA; no significant toxicity reported for Coreopsis.
If a child or pet may have eaten part of a plant, call a poison centre or vet straight away.
Companion planting: what to grow with Large-flowered tickseed (coreopsis)
No well-documented helpful pairing. Group it with plants that like full sun and low water.
See Large-flowered tickseed (coreopsis) in a botanical garden
It grows in this sample garden, which you can walk through in 3D:
- Riverside botanical garden (15 plants)
Questions about Large-flowered tickseed (coreopsis)
- How far apart should I plant Large-flowered tickseed (coreopsis)?
- About 40 cm (16 in) apart, centre to centre. A mature plant spreads 30–50 cm (12–20 in).
- Does Large-flowered tickseed (coreopsis) need full sun?
- Full sun: at least 6 hours of direct sun a day.
- How much water does Large-flowered tickseed (coreopsis) need?
- Low water. Drought tolerance is high and waterlogging tolerance none.
- How cold-hardy is Large-flowered tickseed (coreopsis)?
- It tolerates about -32 °C (-26 °F) once established, roughly USDA zone 4.
- When does Large-flowered tickseed (coreopsis) flower?
- From about June for 9–13 weeks (northern hemisphere; later in cold climates, earlier in warm ones).
- Is Large-flowered tickseed (coreopsis) poisonous to cats and dogs?
- For cats it is not known to be toxic; for dogs not known to be toxic; for people not known to be toxic. Not listed as toxic by ASPCA; no significant toxicity reported for Coreopsis.
- What grows well with Large-flowered tickseed (coreopsis)?
- There is no well-documented companion pairing for Large-flowered tickseed (coreopsis). Group it with plants that like the same sun (full sun) and water (low).
Sources and evidence
Evidence grade B (B: extension service or peer-reviewed).
- Missouri Botanical Garden Plant Finder, Missouri Botanical Garden
- Extension Gardener Plant Toolbox, NC State Extension
- ASPCA Toxic and Non-Toxic Plant List, ASPCA
Notes and assumptions
- Typical garden-form values; cultivars and local conditions differ.
- Short-lived perennial (3 to 4 years); often flowers in its first year from seed. Deadheading prolongs bloom.
Reference values for planning, not horticultural, veterinary or medical advice. Varieties, soils and local climates differ: check with a local nursery or extension service.
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