"You're almost tricking it into thinking it's back in Japan and it has just been hit by an erupting volcano, and it's putting it back into that dormancy, waiting for the bad times," says Eastwood. Unless you can afford to dig out every last rhizome fragment, for larger stands of Japanese knotweed, tricking the plants into a temporary sleep is the best-case-scenario. Smaller ones may die after several years of treatment – but a proportion will eventually rear their little shoots again, perhaps years or even decades later.
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