Yes, the infamous Japanese Knotweed, and I believe that it was imported deliberately in the 19th Century.
Itโs just that I have been visiting sites for the past 25 to 30 years that have remained disused since the turn of the 20th Century, and yet they have become virtually unapproachable just in the last few years.
Maybe itโs just me getting older.
My avatar is a poor likeness.