Unwanted 'immigrants'?

Now here are the real, actually damaging 'immigrants': giant hogweed. Their friends himalayan balsam, the flatworm and many others aren't too far away, i'm sure.

Waiting to see if the Council, the landowner or anyone does anything about the hogweed given that it is too dangerous for individuals to tackle (see last month's report on the girl with the horribly burnt hand)