Photo: Mason Brock ( Masebrock )Public domainvia Wikimedia Commons
Ampherephis wightiana Plant Care
Eupatorium pubescens Muhl.
Updated · Sources · How we source care data
Eupatorium rotundifolium, commonly called roundleaf thoroughwort, is a North American species of plant in the family Asteraceae. It native to the eastern and central United States, in all the coastal states from Maine to Texas, and inland as far as Missouri and the Ohio Valley. It is found in low, moist habitats such as wet savannas and bogs.
Every 7–10 days
Full sun to partial shade
60–80°F
40–70%
At a glance
How do you care for Ampherephis wightiana?
Water Ampherephis wightiana 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 60–80°F (16–27°C) and 40–70% humidity. Fertilize it every 4 months during the growing season.
Where Is the Ampherephis wightiana Native To?
What Is the Ampherephis wightiana?
Ampherephis wightiana (Eupatorium pubescens) belongs to the Asteraceae family within the Eupatorium genus. Ampherephis wightiana is native to the eastern and central United States, in all the coastal states from Maine to Texas, and inland as far as Missouri and the Ohio Valley. Ampherephis wightiana is also known as Carpesium cernuum, Carpesium glossophylloides, Carpesium pedunculosum.
Ampherephis wightiana displays an upright, bushy perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Ampherephis wightiana produces clusters of small, fluffy white or pink flowers.
Leaf size: approximately 6 inches.
How Often Should You Water a Ampherephis wightiana?
Eupatorium pubescens 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 Ampherephis wightiana Need?
Ampherephis wightiana thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Ampherephis wightiana Prefer?
Eupatorium pubescens grows best at temperatures of 60–80°F. Ampherephis wightiana prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a Ampherephis wightiana?
Moist, well-draining soil rich in organic matter. Good drainage is essential for Ampherephis wightiana to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Ampherephis wightiana?
Feed Ampherephis wightiana every 4 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 4 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 Ampherephis wightiana?
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 Ampherephis wightiana?
Ampherephis wightiana can be propagated through seeds, division of rootball. Similar propagation techniques also apply to white thoroughwort plant care, which shares the same genus.
Is the Ampherephis wightiana Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Ampherephis wightiana, 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 Ampherephis wightiana?
Ampherephis wightiana is susceptible to aphids, spider mites, powdery mildew. 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 Ampherephis wightiana Need?
Ampherephis wightiana grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Ampherephis wightiana is native to the eastern and central United States, in all the coastal states from Maine to Texas, and inland as far as Missouri and the Ohio Valley. In cooler regions, grow Ampherephis wightiana as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Ampherephis wightiana 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 Eupatorium genus — compare its care with other Eupatorium species on PlantoScan.
Eupatorium is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Ampherephis wightiana thrives in bright light and direct sun — see other bright-light plants.
More Eupatorium Species
Other Eupatorium species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Eupatorium pubescens Muhl., family Asteraceae — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Ampherephis wightiana, 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: Mason Brock ( Masebrock ), Public domain, Wikimedia Commons — original.
- Hardiness zone: USDA Zone 13a, 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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