Invasive Plants Association of Wisconsin| Purple Loosestrife (Lythrum salicaria) |
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| Reed Canary
Grass (Phalaris arundinacea L.) |
 UW Herbarium Photographer: Stephen L. Solheim |
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| Black Locust Robinia pseudoacacia L. |
 UW Herbarium Photographer Michael Clayton |
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Pastinaca sativa L. |
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Forests are important to Wisconsin in many ways. They provide habitat for wildlife, recreation for tourists, and protection for our watersheds. They are also being invaded on a major scale by nonnative plants.
These invaders shade out native vegetation and reduce the health of the forest. They can have long-term significance for forest survival.
The important thing is to detect their presence early and initiate immediate eradication. If you detect one of these invaders in your woods, waiting for another year is not an option. Eradication should start now.
Fortunately, all three of these species can be controlled by standard, approved, methods. Click on the link for each to see species-specific control measures.
The three most important invaders of Wisconsin's forests are:
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Garlic mustard
(Alliaria petiolata) |
 garlic mustard |
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Common buckthorn
(Rhamnus cathartica)
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 buckthorn |
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Honeysuckle
(species of Lonicera)
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 honeysuckle
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Phragmites webpage by the Wisconsin Wetlands Association
The following links take you to the Wisconsin DNR Invasive Species website:
Multiflora
Rose (Rosa multiflora)
Spotted
Knapweed (Centaurea maculosa)
Leafy
Spurge (Euphorbia esula)
Eurasian
Water Milfoil (Myriophyllum spicatum)
New Weeds to Watch For
Additional Widespread and Known Invasive
Glossy buckthorn
Dame's Rocket
Canada thistle
Phragmites, Common Reed
Autumn Olive
Curly leaf pondweed
Narrow-leaf and hybrid cattail
Oriental bittersweet
Bird’s foot trefoil
Crown vetch
White and yellow sweet clovers
For additional information about these and other plants, see our Links page.
