knotweed
noun
knot·weed ˈnät-ˌwēd 
: any of several herbs (genus Polygonum) of the buckwheat family with leaves and bracts jointed and having a very short petiole
broadly : polygonum
Example Sentences
Recent Examples on the Web The now-30-year-old Nelson makes videos about magnolia blossoms, maple leaves, dandelion fritters, even invasive species like Japanese knotweed. 
Gabriel Popkin, Washington Post, 15 Aug. 2022 Don’t buy land invaded by Japanese knotweed, which is impossible to defeat with its spread, which can reach up to 65 feet underground. Carol Stocker, BostonGlobe.com, 10 Apr. 2022 Giant hogweed and Japanese knotweed both were originally used as garden plants. Brittany Trang, Milwaukee Journal Sentinel, 10 Aug. 2021 Another problem is the Japanese knotweed that has taken over the yard. Kelly Klein, Star Tribune, 25 June 2021 Bohn is worried that in a few years, Milwaukee might be rife with infrastructure problems from new Japanese knotweed populations. Brittany Trang, Milwaukee Journal Sentinel, 10 Aug. 2021 Since the Fifties, such literature has grown like Japanese knotweed over the shelves of airport bookstores, and its authors have filled hotel conference rooms with eager seminar attendees. Hari Kunzru, Harper's Magazine, 27 Apr. 2021 Readers of the book will find new ways to prepare vegetables, from celery root to cauliflower, and learn about more unusual ingredients like carrot seeds, knotweed and radish seed pods. Mark Kennedy, Star Tribune, 21 Apr. 2021 His special passion was attempting to eradicate Japanese knotweed, an invasive plant that resembles tall bamboo. courant.com, 19 Mar. 2021 See More
Gabriel Popkin, Washington Post, 15 Aug. 2022 Don’t buy land invaded by Japanese knotweed, which is impossible to defeat with its spread, which can reach up to 65 feet underground. Carol Stocker, BostonGlobe.com, 10 Apr. 2022 Giant hogweed and Japanese knotweed both were originally used as garden plants. Brittany Trang, Milwaukee Journal Sentinel, 10 Aug. 2021 Another problem is the Japanese knotweed that has taken over the yard. Kelly Klein, Star Tribune, 25 June 2021 Bohn is worried that in a few years, Milwaukee might be rife with infrastructure problems from new Japanese knotweed populations. Brittany Trang, Milwaukee Journal Sentinel, 10 Aug. 2021 Since the Fifties, such literature has grown like Japanese knotweed over the shelves of airport bookstores, and its authors have filled hotel conference rooms with eager seminar attendees. Hari Kunzru, Harper's Magazine, 27 Apr. 2021 Readers of the book will find new ways to prepare vegetables, from celery root to cauliflower, and learn about more unusual ingredients like carrot seeds, knotweed and radish seed pods. Mark Kennedy, Star Tribune, 21 Apr. 2021 His special passion was attempting to eradicate Japanese knotweed, an invasive plant that resembles tall bamboo. courant.com, 19 Mar. 2021 See More Word History
First Known Use
1884, in the meaning defined above