Roundleaf Thoroughwort
Eupatorium rotundifolium
Last reviewed: August 2026
Roundleaf thoroughwort is a clump-forming forb that blooms from June through November with small white flower clusters, growing well in full sun and medium to dry soils typical of open woodlands and sandy fields.
Toxicity unknown
Roundleaf Thoroughwort (Eupatorium rotundifolium) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
full sun
Water
medium
Size
24"–36" H × 6"–18" W
Bloom
Jun, Jul, Aug, Sep, Oct, Nov
Native to
AL, AR, DE, FL and 19 more states
Pollinators
butterflies, bees
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 452 programs across 44 states, each with a link to the provider and the date we last checked it.
Find rebates in your areaBrowse plants for this ecoregion
Roundleaf Thoroughwort is a native Texas perennial that forms upright clumps with rounded leaves and produces clusters of small white flowers from summer through fall. This medium-sized wildflower thrives in full sun with moderate water needs and provides months of reliable blooms. The plant goes dormant in winter, returning each spring with fresh growth.
Growing Roundleaf Thoroughwort
Grow Roundleaf Thoroughwort in full sun and medium water. Mature plants reach 24 to 36 inches tall and spread 6 to 18 inches wide. Expect low maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Roundleaf Thoroughwort is an HOA-friendly choice. Maintenance level: low. Tidiness: 2 out of 5.
Works well in: front yard, foundation, street edge, mid zone.
Wildlife value
This plant is excellent for pollinators, attracting both butterflies and native bees throughout its extended blooming period. The long flowering season from June through November provides crucial late-season nectar when many other plants have finished blooming.
Common questions
- When does roundleaf thoroughwort bloom?
- Roundleaf thoroughwort typically flowers from June through November, with peak bloom in late summer and early fall.
- What kind of light does roundleaf thoroughwort need?
- It grows best in full sun but can tolerate part sun, especially at the edges of woodlands or fields.
- How much water does roundleaf thoroughwort require?
- This forb prefers medium moisture but adapts to drier, sandy soils once established, making it suited to open pine woods and dry meadows.
- What pollinators visit roundleaf thoroughwort?
- Butterflies and bees are the main visitors, drawn to the small clustered white flowers during the late summer and fall bloom period.
- Is Roundleaf Thoroughwort HOA-friendly?
- Roundleaf Thoroughwort is generally an HOA-friendly choice in the right placement, with low maintenance.
These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.
Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Roundleaf Thoroughwort? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Planning a bed around it? Start a free plan with this plant
Not sure where to start? Take the 2-minute yard quiz