• synonyms


  1. any of several knotty-stemmed plants belonging to the genus Polygonum, of the buckwheat family.
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Origin of knotweed

First recorded in 1570–80; knot1 + weed1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for knotweed

Contemporary Examples

Historical Examples

  • It is Polygonum Virginicum, and so far without a common name, unless Virginia knotweed be satisfactory.

    Seed Dispersal

    William J. Beal

  • Those of us who are gardeners will certainly agree that “unfortraedde” is the right name for knotweed.

    The Old English Herbals

    Eleanour Sinclair Rohde

British Dictionary definitions for knotweed


  1. any of several polygonaceous plants of the genus Polygonum, having small flowers and jointed stems
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012