Probably. It's a menace on riverbanks because it can completely take over, then dies away completely in winter leaving only seeds, exposing the river bank to erosion. It's typically five or six feet tall with pink flowers that look a bit like dangly slippers. These are followed by oval, ribbed seed pods that burst open when touched once they're ripe, shooting the seeds out several feet. The plant has a fairly unpleasant smell when en masse. A definite undesirable alien. River and canal banks in the north of England are a particular stronghold. Some people call it policeman's helmet, but they're just bellends...