• Japanese knotweed must be picked up after cutting. Otherwise the pieces will start new plants

    Slide #1
  • Oriental bittersweet has fruits located along the entire length of the stem at the leaf nodes
    Slide #2
  • Now is the time that birds fill-up on Buckthorn berries and disperse their seeds
    Slide #3
  • Common burdock's Velcro-like burs have been known to ensnarl birds, bats and butterflies

    Slide #4
  • Crown Vetch is known to climb over and shade out other plant species
    Slide #5
  • Porcelain berry is just starting to show its' fall shades of blues, purples and pinks
    Slide #6

Upcoming Events


Invasive Plant & Earthworm Workshops begin. Workshops throughout the state end Oct 2nd. More


IPAW will have an exhibit at the 2015 Midwest Environmental Education Conference (MEEC) Oct 21-22. More


IPAW Board of Directors meeting - date, time and location 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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