Species Spotlight Management

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Hawkweeds

Fourteen exotic hawkweeds grow in western North America. Strategically timed herbicide applications can improve invasive hawkweed control and promote establishment of desirable grasses.  [ READ MORE ]


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Leafy Spurge

The optimum leafy spurge growth state to apply selective herbicides is when the flower is visible—after yellow bracts are formed—in late spring or early summer.  [ READ MORE ]


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Sulfur Cinquefoil

This invasive perennial forb is reported in all 48 contiguous U.S. states and in southern Canadian provinces. Biology, impacts, and management of this plant are described.  [ READ MORE ]


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Canada Thistle

The optimum time to control Canada thistle is in the summer after Canada thistle plants are fully emerged in June through  August.  [ READ MORE ]