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Tall Thoroughwort (Eupatorium altissimum)

An upright perennial of dry, sunny, disturbed habitats, often on high-pH soils, native to the eastern to central US and expanding into the northeast.

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Purple Deadnettle (Lamium purpureum)

A winter annual native to Eurasia and introduced in North America, usually found on rich, moist sites with disturbed soil.

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White Snakeroot (Ageratina altissima)

A poisonous perennial herb native to eastern North America. One of the most common members of the Eupatorieae tribe of the aster family. In much of its range, among the last wildflowers to bloom in fall.

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Mid-Boreal Uplands and Peace-Wabaska Lowlands

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Clear Hills and Western Alberta Uplands

A hilly region central along the Alberta-British Columbia border, east of the Canadian Rockies, covered in boreal forest.

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Northern Cross Timbers

A region in Oklahoma and slightly into Kansas, with varied topography, soils, and vegetation cover.

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Ground Ivy (Glechoma hederacea) vs. Purple Deadnettle (Lamium purpureum)

These introduced species are sometimes confused; both are common in gardens and they can grow together in the same habitat. They can be easily distinguished by leaves, flowers, and life cycle. Glechoma hederacea ranges much farther north, can survive in mowed lawns, is present year-round, and is more restricted to partly-sunny exposures, whereas Lamium purpureum inhabits a broader range of lighting conditions, from full sun to areas under a canopy of deciduous trees, and is absent in summer.

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Ground Ivy (Glechoma hederacea) vs. Henbit Deadnettle (Lamium amplexicaule)

These two introduced species are often confused; both are common in lawns and gardens, and they are visually similar and can grow together in the same habitat. They can be easily distinguished by upper leaves, flowers, and life cycle. Glechoma hederacea ranges much farther north, can survive in mowed lawns, is present year-round, and is more restricted to part-shade and moist conditions, whereas Lamium purpureum ranges farther south, ranges into full sun and drier conditions, and is absent in summer.

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Henbit Deadnettle (Lamium amplexicaule) vs. Purple Deadnettle (Lamium purpureum)

These introduced weedy annuals, both low-grade invasives in much of North America, overlap greatly in range and habitat, and are visually similar. They can be easily distinguished by close examination of the arrangement of leaves and flowers near the stem tips. L. purpureum is slightly more shade-tolerant, whereas L. amplexicaule has a slightly more extensive range and ranges into slightly drier conditions.

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