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Late Boneset (Eupatorium serotinum)

Also known as lateflowering thoroughwort.

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Late Boneset


A perennial of sunny, disturbed, average to wet areas, native to the southeastern to central US, expanding into the northeast.

Range - Expand

Native or Not Present
Native or Expanded
Expanded or Not Present
Native or Expanded or Not Present

This tentative map is based on our own research. It may have limited data on Canada and/or Mexico, and there is some subjectivity in our assignment of plants as introduced vs. expanded. Read more in this blog post.

Similar Plants

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White Snakeroot (Ageratina altissima)
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thumbnail of Tall Thoroughwort
Tall Thoroughwort (Eupatorium altissimum)
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Found in a range of open to partly-sunny areas with moist conditions, especially areas that have been disturbed recently. Habitats include sunny opening in floodplains and swamps, moist black soil prairies, wet ditches along roadsides and railroads, and wet portions of abandoned fields or overgrazed pastures. Prefers loamy soil rich in organic matter.

Relative to E. perfoliatum, late boneset is more tolerant of heat and drought and less tolerant of flooding, clay and compacted soils, and soil erosion. Relative to Ageratina altissima, late boneset is less shade tolerant.

Faunal Associations

Supports a wide range of insects, mostly those that are supported broadly by plants of the Eupatorieae tribe. The nectar is highly accessible and supports a wide range of pollinators, including long- and short-tongued bees, wasps, flies, butterflies, skippers, and moths, and including insects of a broad range of sizes. Several moth larvae eat the foliage of this plant. The seeds are eaten by small birds.

Mammalian herbivores avoid this plant due to its toxicity.


Historically this plant was used medicinally. Unlike some of its relatives, this plant is rarely used in landscaping.

In North America, there are around 30 other species in the Eupatorium genus, all but one of them native. There are even more species in the broader Eupatoriae tribe.

Eupatorium serotinum (Late Boneset) | Illinois Wildflowers (About This Site)

Eupatorium serotinum (Late Boneset) | USDA PLANTS Database (About This Site)

Eupatorium serotinum | Go Botany (About This Site)

Late Boneset | iNaturalist (About This Site)

Eupatorium serotinum | Biota of North America Project (BONAP) (About This Site)

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