Photo: marekCC BY 4.0via iNaturalistresized / cropped
Cup Evening Primrose Plant Care
Chylismia claviformis (Torr. & Frém.) A.Heller
Updated · Sources · How we source care data
This plant is known for its unique bright yellow flowers that bloom in clusters. It originates from the southwestern United States and northern Mexico, thriving in dry, rocky habitats. Plant collectors are drawn to its striking appearance and ability to add a pop of color to any garden.
Every 14–21 days
Full sun to partial shade
60–80°F
20–40%
At a glance
How do you care for Cup Evening Primrose?
Water Cup Evening Primrose every 14–21 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 60–80°F (16–27°C) and 20–40% humidity.
Where Is the Cup Evening Primrose Native To?
What Is the Cup Evening Primrose?
Cup Evening Primrose (Chylismia claviformis) belongs to the Onagraceae family within the Chylismia genus. Cup Evening Primrose is native to North America. Cup Evening Primrose is also known as Evening Primrose.
Cup Evening Primrose displays a low spreading perennial growth habit, reaching up to 1 ft tall with a spread of approximately 1 ft. Cup Evening Primrose produces bright yellow cup-shaped flowers.
Leaf size: approximately 2 inches.
How Often Should You Water a Cup Evening Primrose?
Chylismia claviformis requires watering every 14–21 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 14–21 days
Let soil partially dry between waterings
What Light Does the Cup Evening Primrose Need?
Cup Evening Primrose thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Cup Evening Primrose Prefer?
Chylismia claviformis grows best at temperatures of 60–80°F. Cup Evening Primrose prefers humidity levels of 20–40%.
Temperature
60–80°F
Humidity
20–40%
What Soil Mix Works Best for a Cup Evening Primrose?
Well-draining sandy soil with added organic matter like compost. Good drainage is essential for Cup Evening Primrose to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Cup Evening Primrose?
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 Cup Evening Primrose?
Cup Evening Primrose can be propagated through seeds, division of root ball. Similar propagation techniques also apply to heartleaf suncup plant care, which shares the same genus.
Is the Cup Evening Primrose Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Cup Evening Primrose, 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 Cup Evening Primrose?
Cup Evening Primrose is susceptible to aphids, spider mites, whiteflies. 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 Cup Evening Primrose Need?
Cup Evening Primrose grows outdoors in USDA Zone 8a – 11b. It survives winters down to planting zone 8a. Cup Evening Primrose is native to North America.
Hardiness Zone
Zone 8a – 11b
Keep exploring plants
Cup Evening Primrose 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 Chylismia genus — compare its care with other Chylismia species on PlantoScan.
Chylismia is part of the Onagraceae plant family — browse all Onagraceae genera and species.
Cup Evening Primrose thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Chylismia claviformis (Torr. & Frém.) A.Heller, family Onagraceae (first published in Muhlenbergia 2: 105 (1906)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Cup Evening Primrose, 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: marek, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 8a – 11b, estimated from the plant's typical growing conditions.
- 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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