It has been known to cause damage to buildings by targeting weak points, such as cracks in masonry, and attempting to grow through them.
With more than 29,500 confirmed cases each year, Wigan is also affected by this difficult-to-get-rid-of plant.
By visiting https://horticulture.co.uk/japanese-knotweed/ you can view cases in your area, when they were reported and record more sightings of your own.
Here are some areas in Wigan affected by the weed.
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