Hardham's Sun Cup Plant Care
Camissoniopsis hardhamiae (P.H.Raven) W.L.Wagner & Hoch
Updated · Sources · How we source care data
Camissoniopsis hardhamiae is a species of evening primrose known by the common name Hardham's evening primrose. It is endemic to California, where it grows in the chaparral and woodland of San Luis Obispo and Monterey Counties.
Full sun to partial shade
At a glance
How do you care for Hardham's Sun Cup?
Hardham's Sun Cup grows best in full sun to partial shade.
Where Is the Hardham's Sun Cup Native To?
What Is the Hardham's Sun Cup?
Hardham's Sun Cup (Camissoniopsis hardhamiae) belongs to the Onagraceae family within the Camissoniopsis genus. Hardham's Sun Cup is native to California.
Hardham's Sun Cup displays a low rosette, spreading growth habit, reaching up to tall with a spread of approximately . Hardham's Sun Cup produces bright yellow cup-shaped flowers.
What Light Does the Hardham's Sun Cup Need?
Hardham's Sun Cup thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Soil Mix Works Best for a Hardham's Sun Cup?
Well-draining sandy soil with some organic matter. Good drainage is essential for Hardham's Sun Cup to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Hardham's Sun Cup?
Repot 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 Hardham's Sun Cup?
Hardham's Sun Cup can be propagated through seeds. Similar propagation techniques also apply to bistort island bushmallow plant care, which shares the same genus.
Is the Hardham's Sun Cup Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Hardham's Sun Cup, 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 Hardham's Sun Cup?
Hardham's Sun Cup is susceptible to aphids, spider mites. 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.
Keep exploring plants
Hardham's Sun Cup 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 Camissoniopsis genus — compare its care with other Camissoniopsis species on PlantoScan.
Camissoniopsis is part of the Onagraceae plant family — browse all Onagraceae genera and species.
Hardham's Sun Cup thrives in bright light and direct sun — see other bright-light plants.
More Camissoniopsis Species
Other Camissoniopsis species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Camissoniopsis hardhamiae (P.H.Raven) W.L.Wagner & Hoch, family Onagraceae (first published in Syst. Bot. Monogr. 83: 204 (2007)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Hardham's Sun Cup, 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.
- 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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