• Periwinkle's leaves are evergreen and can be seen through the snow
    Slide #1
  • The fruits of Japanese barberry are dispersed by birds and deer
    Slide #2
  • Growing up to 8' tall, Phragmites can be seen along highways
    Slide #3
  • The IPAW booth at the 2015 Garden Expo
    Slide #4
  • Garlic mustard waiting for spring to flower
    Slide #5
  • Oriental bittersweet berries in the snow
    Slide #6

Upcoming Events


Garden Expo begins. Runs Feb 12-14 in Madison, WI. Stop by the IPAW booth! More


The Prairie Enthusiasts annual conference and banquet, Madison, WI. Visit the IPAW booth. More


WI Wetland Science Conference begins. Runs Feb 23-25 in Greenbay, WI. Visit the IPAW booth. More


IPAW Board of Director Meeting date, place and time to be announced

Other Invasive-Related Events

Welcome to Our Website

IPAW logo"Slowly, but persistently, making their way across the land, ecologically invasive plants are the silent invaders of our time" quoted from Elizabeth J. Czarapata's book Invasive Plants of the Upper Midwest. Most of us don't even know they exist. We have the illusion of lush, green landscapes, when in fact, much of what we see are invasive plant species. In reality, invasive species have contributed directly to the decline of 49% of threatened or endangered species in the United States. The annual cost to the United States economy is estimated at $138 billion a year, with over 100 million acres suffering from invasive plant infestations. Because there is a need for a greater understanding, it is IPAW's mission "to promote better stewardship of the Natural Resources of Wisconsin by advancing the understanding of invasive plants and encouraging the control of their spread."

We invite you to take a look at our website, and we hope to persuade you about the importance of controlling invasive plant species in Wisconsin... or wherever you may live.

New Threats to Wisconsin

Japanese stilt grass
Japanese stilt grass

It's almost here! Japanese stilt grass is currently found in Illinois, less than 15 miles from the Wisconsin border.

Porcelain berry
Porcelain berry

A climbing vine in the grape family, first introduced as an ornamental landscape plant from temperate Asia.

Japanese hedge parsley
Japanese hedgeparsley

A member of the carrot family, this species is rapidly spreading and has the potential to invade to most regions of the state.


Our Mission

"To promote better stewardship of the natural resources of Wisconsin by advancing the understanding of invasive plants and encouraging the control of their spread."

Contact Us

PO Box 5274
Madison, WI 53705-0274
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