Usage History of 'knotweeds'

The following chart shows how frequently 'knotweeds' appeared in printed materials over time. For example, the word 'knotweeds' occurred 4 times in books in 1856 and 76 times in 2008. From 1856 to 2008, the word 'knotweeds' was used a total of 2,499 times in books scanned by Google. See Reference: Google Ngram project.

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