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Content tagged with "Spotted Knapweed"

Spotted Knapweed Flower

Controlling the scourge of invasive spotted knapweed

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Invasive species, such as spotted knapweed, are a top threat to Missouri’s native plants and animals.

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Photo of spotted knapweed flower head showing spots on involucral bracts

Don’t lose ground to invasive spotted knapweed

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News and Events

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"News and Events" for the February 2010 Missouri Conservationist.

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Photo of spotted knapweed flower head showing spots on involucral bracts

Spotted Knapweed

Centaurea stoebe
Spotted knapweed is an invasive plant that outcompetes native communities, takes over pastureland, and even beats back invasive sericea lespedeza! It has arrived in our state. Let’s prevent its spread.

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Photo of spotted knapweed flower head showing spots on involucral bracts

Spotted Knapweed (Flower)

The black, arrow-shaped spot on each bract gives spotted knapweed its common name.

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Photo of spotted knapweed plant showing foliage and growth habit

Spotted Knapweed (Leaves)

A single spotted knapweed plant can have a single stem or as many as 20 stems. It usually flowers in the second year, producing branched stems. The leaves are alternate, deeply lobed, and pale blue-gray.

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Spotted Knapweed Flower

Spotted Knapweed Flower

One of Missouri's most harmful invasive plant species is spotted knapweed.

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Spotted Knapweed Leaves

Spotted Knapweed Leaves

One of Missouri's most harmful invasive plant species is spotted knapweed.

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Spotted Knapweed Plant

Spotted Knapweed Plant

One of Missouri’s most harmful invasive plant species is spotted knapweed.

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Photo of spotted knapweed rosette, formed in the first year of growth

Spotted Knapweed Rosette

By the end of its first year, a knapweed plant is a small basal rosette. It usually bolts in the second year, producing branched stems.

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