Japanese knotweed
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Japanese Knotweed is in-fact considered a weed. Since the introduction here in the 19th century for rich people's entertainment they have colonised almost every riverbank, road verge, and rastafarians house in the country. No longer can one go for a nice walk in any of these locations without tripping over the carelessly strewn limbs of these weeds, (the knots are often undone while at rest). Speaking only Japanese, they impact heavily on local biodiversity.
Despite efforts to trick local stoners into cleaning up the excessive foliage the weed continues to spread like, um... Japanese knotweed.
