• Japanese knotweed is listed as one of the world's 100 worst invasive species
    Slide #1
  • Oriental bittersweet can be spread by holiday decorations made with it
    Slide #2
  • Burning bush is often spread by birds who eat the berries
    Slide #3
  • An aggressive ground cover, periwinkle can outcompete native species
    Slide #4
  • The IPAW booth at the Wisconsin Wetland's Association meeting in 2016
    Slide #5
  • Prior to berry production, porcelain berry is often confused with grape
    Slide #6

Upcoming Events


IPAW Board Meeting 1-3 pm, DNR Office, GEF 2, 101 S Webster Street, Room 628, Madison, WI


IPAW Board Meeting 1-3 pm, location to be determined.


Wisconsin Public Television's Garden Expo begins. Stop by the IPAW booth. More

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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