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knotgrass

British  
/ ˈnɒtˌɡrɑːs /

noun

  1. Also called: allseed.  a polygonaceous weedy plant, Polygonum aviculare, whose small green flowers produce numerous seeds

  2. any of several related plants

"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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

When the Prince’s Foundation took over the walled garden, it was a sea of knotgrass.

From Washington Post • Nov. 1, 2021

This Series should play on a field of gout-wort, grommel and knotgrass.

From New York Times • Oct. 24, 2016

“There’s something else,” said Harry, watching Hermione tearing bundles of knotgrass and throwing them into the potion.

From "Harry Potter And The Chamber Of Secrets" by J. K. Rowling

I will not say but that he may pass for an historian in Garbier's academy; he is much of the size of those knotgrass professors.

From Character Writings of the 17th Century by Various

What, again, of weed seeds in general, and knotgrass in particular?

From "Wee Tim'rous Beasties" Studies of Animal life and Character by English, Douglas