knotweed

[not-weed]

noun

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

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 of knotweed

Japanese knotweed, for all its invasive attributes, was an ornamental plant for the Victorians.
The Best of Brit Lit
Peter Stothard
December 17, 2010

Historical Examples of knotweed

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

knotweed

noun

any of several polygonaceous plants of the genus Polygonum, having small flowers and jointed stems

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