Invasive non-native species, of which Japanese knotweed is one, are sometimes referred to in the United Kingdom (UK) as “alien species.” They include plants introduced by accident or deliberately into a natural environment where they are not normally found––causing serious negative consequences. Japanese knotweed also has spread to the United States and is causing problems there, but the United States does not yet have legislation addressing Japanese knotweed like that found in the UK, which is briefly summarized here. A recent case has raised even higher the profile of this plant and the costs associated with it.
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