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Late Boneset (Eupatorium serotinum)

Also known as lateflowering thoroughwort.

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Late Boneset


A perennial native to North America, this species has been expanding its range to the northeast in response to humans creating more open habitats.

Range - Expand


This tentative map is based on the FHWA's ERA. This data lacks information on Canada, but also overestimates native ranges, especially around the edges, as this post explains. We have not yet reviewed or fixed this map.

USDA Plants Profile for Eupatorium serotinum

Illinois Wildflowers Page for Eupatorium serotinum

Similar Plants

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White Snakeroot (Ageratina altissima)
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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.

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