Pseudostellaria oxyphylla Plant Care
Pseudostellaria oxyphylla (B.L.Rob.) R.L.Hartm. & Rabeler
Updated · Sources · How we source care data
Hartmaniella oxyphylla, the robust starwort or Robinson's starwort, is a rare species of plant endemic to the north-western United States, where it is known only from Kootenai and Shoshone Counties, Idaho. It grows along stream-banks in conifer forests at elevations of 800–900 m.
Every 3–5 days
Partial shade to full shade
50–75°F
40–60%
At a glance
How do you care for Pseudostellaria oxyphylla?
Water Pseudostellaria oxyphylla every 3–5 days, letting the top layer of soil dry out between waterings, and give it partial shade to full shade. It prefers temperatures of 50–75°F (10–24°C) and 40–60% humidity. Fertilize it every 6 months during the growing season.
Where Is the Pseudostellaria oxyphylla Native To?
What Is the Pseudostellaria oxyphylla?
Pseudostellaria oxyphylla (Pseudostellaria oxyphylla) belongs to the Caryophyllaceae family within the Pseudostellaria genus. Pseudostellaria oxyphylla is native to the north-western United States.
Pseudostellaria oxyphylla displays a low-growing, spreading perennial growth habit, reaching up to 0.5 ft tall with a spread of approximately 1 ft. Pseudostellaria oxyphylla produces small, white, star-shaped flowers in clusters.
Leaf size: approximately 1.5 inches.
How Often Should You Water a Pseudostellaria oxyphylla?
Pseudostellaria oxyphylla requires watering every 3–5 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 3–5 days
Let soil partially dry between waterings
What Light Does the Pseudostellaria oxyphylla Need?
Pseudostellaria oxyphylla thrives in partial shade to full shade. The optimal light range is 50–200 lux. Avoid placing Pseudostellaria oxyphylla in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Partial shade to full shade
50–200 lux
What Temperature and Humidity Does the Pseudostellaria oxyphylla Prefer?
Pseudostellaria oxyphylla grows best at temperatures of 50–75°F. Pseudostellaria oxyphylla prefers humidity levels of 40–60%.
Temperature
50–75°F
Humidity
40–60%
What Soil Mix Works Best for a Pseudostellaria oxyphylla?
Well-draining, loamy soil with added organic matter for moisture retention. Good drainage is essential for Pseudostellaria oxyphylla to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Pseudostellaria oxyphylla?
Feed Pseudostellaria oxyphylla 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 Pseudostellaria oxyphylla?
Divide and 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 Pseudostellaria oxyphylla?
Pseudostellaria oxyphylla can be propagated through division, seeds. Similar propagation techniques also apply to greater stitchwort plant care, which shares the same genus.
Is the Pseudostellaria oxyphylla Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Pseudostellaria oxyphylla, 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 Pseudostellaria oxyphylla?
Pseudostellaria oxyphylla is susceptible to aphids, spider mites, slugs. 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 Pseudostellaria oxyphylla Need?
Pseudostellaria oxyphylla grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Pseudostellaria oxyphylla is native to the north-western United States. In cooler regions, grow Pseudostellaria oxyphylla as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Pseudostellaria oxyphylla 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 Pseudostellaria genus — compare its care with other Pseudostellaria species on PlantoScan.
Pseudostellaria is part of the Caryophyllaceae plant family — browse all Caryophyllaceae genera and species.
Pseudostellaria oxyphylla copes with lower light than most plants — browse the full list of low-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Pseudostellaria oxyphylla (B.L.Rob.) R.L.Hartm. & Rabeler, family Caryophyllaceae (first published in Sida 21: 176 (2004)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Pseudostellaria oxyphylla, 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.
- 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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