Photo: sarefoCC BY-SA 3.0via Wikimedia Commonsresized / cropped
Stillman's coreopsis Plant Care
Coreopsis stillmanii (A.Gray) S.F.Blake
Updated · Sources · How we source care data
Coreopsis stillmanii is a species of flowering plant in the family Asteraceae known by the common name Stillman's tickseed. It is endemic to California, where it grows in the Central Valley and most of the adjacent coastal and inland mountain ranges in California chaparral and woodlands habitats. It is found east of San Francisco Bay (Contra Costa, Alameda, Santa Clara, Stanislaus Counties) and on the eastern side of the Central Valley (from Placer County to Fresno County).
Every 7–10 days
Full sun to partial shade
50–80°F
40–60%
At a glance
How do you care for Stillman's coreopsis?
Water Stillman's coreopsis every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 50–80°F (10–27°C) and 40–60% humidity. Fertilize it every 6 months during the growing season.
Where Is the Stillman's coreopsis Native To?
What Is the Stillman's coreopsis?
Stillman's coreopsis (Coreopsis stillmanii) belongs to the Asteraceae family within the Coreopsis genus. Stillman's coreopsis is native to California. Stillman's coreopsis is also known as Coreopsis stillmanii.
Stillman's coreopsis displays an upright, bushy perennial growth habit, reaching up to 2 ft tall with a spread of approximately 1.5 ft. Stillman's coreopsis produces daisy-like flowers in shades of yellow, pink, or red.
Leaf size: approximately 4 inches.
How Often Should You Water a Stillman's coreopsis?
Coreopsis stillmanii requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Stillman's coreopsis Need?
Stillman's coreopsis thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Stillman's coreopsis Prefer?
Coreopsis stillmanii grows best at temperatures of 50–80°F. Stillman's coreopsis prefers humidity levels of 40–60%.
Temperature
50–80°F
Humidity
40–60%
What Soil Mix Works Best for a Stillman's coreopsis?
Well-draining sandy loam with added compost for nutrients. Good drainage is essential for Stillman's coreopsis to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Stillman's coreopsis?
Feed Stillman's coreopsis every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Stillman's coreopsis?
Divide and replant every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Stillman's coreopsis?
Stillman's coreopsis can be propagated through seeds, division of clumps. Similar propagation techniques also apply to desert coreopsis plant care, which shares the same genus.
Is the Stillman's coreopsis Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Stillman's coreopsis, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Stillman's coreopsis?
Stillman's coreopsis is susceptible to aphids, spider mites, leaf miners. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Stillman's coreopsis Need?
Stillman's coreopsis grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Stillman's coreopsis is native to California. In cooler regions, grow Stillman's coreopsis as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Stillman's coreopsis is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Coreopsis genus — compare its care with other Coreopsis species on PlantoScan.
Coreopsis is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Stillman's coreopsis thrives in bright light and direct sun — see other bright-light plants.
More Coreopsis Species
Other Coreopsis species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Coreopsis stillmanii (A.Gray) S.F.Blake, family Asteraceae (first published in Proc. Amer. Acad. Arts 49: 342 (1913)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Stillman's coreopsis, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: sarefo, CC BY-SA 3.0, Wikimedia Commons — original.
- Hardiness zone: USDA Zone 12a, calculated from the plant's minimum temperature.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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