Crossword Genius

Japanese __, perennial plant (8)

Ross

I believe the answer is:

knotweed

(Other definitions for knotweed that I've seen before include "Common plant of dock family" , "Japanese invasive plant species" , "Plant of Polygonum genus" , "it has swollen joints" , "Common plant with jointed creeping stems" .)

I've seen this clue in The Guardian.
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