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What is Japanese Knotweed, and how can I get rid of it?

Knotweed Foliage

Originally imported as an ornamental in the late 1800s, Japanese knotweed
was recognized decades later as one of the most tenacious, aggressive and
invasive plants ever imported to the Western Hemisphere.

Knotweed Stalks

Eliminating knotweed will be a long-term process with repeated
effort for several years. We will coach you through the process.
Through education and identification and community-wide
efforts, we hope one day Rockport will become free
of this noxious weed.

Overview to Knotweed Treatment Options

Additional references:

King County [WA State] Noxious Weed Control
http://your.kingcounty.gov/dnrp/library/water-and-land/
weeds/BMPs/Knotweed-Control.pdf

Montana State University Extension Service:
https://store.msuextension.org/Products/Biology-Ecology-and-Management-of-the-Knotweed-Complex EB0196.aspx

New England Wildflower Society:
http://www.newfs.org/protect/invasive-plants/removal/common-invasives-management.html