Broadleaf Ironweed Plant Care
Vernonia glauca Willd.
Updated · Sources · How we source care data
Vernonia glauca, Upland Ironweed, Appalachian Ironweed, of Broadleaf Ironweed, is a species of herbaceous perennial flowering plant in the family Asteraceae. It is endemic to the eastern United States.
Every 7–10 days
Full sun to partial shade
60–80°F
40–70%
At a glance
How do you care for Broadleaf Ironweed?
Water Broadleaf Ironweed 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 6 months during the growing season.
Where Is the Broadleaf Ironweed Native To?
What Is the Broadleaf Ironweed?
Broadleaf Ironweed (Vernonia glauca) belongs to the Asteraceae family within the Vernonia genus. Broadleaf Ironweed is native to the eastern United States. Broadleaf Ironweed is also known as Ironweed.
Broadleaf Ironweed displays an upright, bushy perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Broadleaf Ironweed produces small purple composite flowers in clusters.
Leaf size: approximately 6 inches.
How Often Should You Water a Broadleaf Ironweed?
Vernonia glauca 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 Broadleaf Ironweed Need?
Broadleaf Ironweed thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Broadleaf Ironweed Prefer?
Vernonia glauca grows best at temperatures of 60–80°F. Broadleaf Ironweed prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a Broadleaf Ironweed?
Well-draining loamy soil with added compost for nutrients. Good drainage is essential for Broadleaf Ironweed to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Broadleaf Ironweed?
Feed Broadleaf Ironweed 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 Broadleaf Ironweed?
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 Broadleaf Ironweed?
Broadleaf Ironweed can be propagated through seeds, division of root ball. Similar propagation techniques also apply to narrowleaf ironweed plant care, which shares the same genus.
Is the Broadleaf Ironweed Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Broadleaf Ironweed, 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 Broadleaf Ironweed?
Broadleaf Ironweed 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 Broadleaf Ironweed Need?
Broadleaf Ironweed grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Broadleaf Ironweed is native to the eastern United States. In cooler regions, grow Broadleaf Ironweed as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Broadleaf Ironweed 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 Vernonia genus — compare its care with other Vernonia species on PlantoScan.
Vernonia is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Broadleaf Ironweed thrives in bright light and direct sun — see other bright-light plants.
More Vernonia Species
Other Vernonia species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Vernonia glauca Willd., family Asteraceae (first published in Sp. Pl., ed. 4 , 3: 1633 (1803)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Broadleaf Ironweed, 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 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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