help: Japanese Knot Weed?

[Dunmail]

>> I should appreciate it if someone could tell me what Japanese knot 
>weed
>> is and how to control it.  I was recently asked how to eliminate a
>> patch that's growing just outside the person's house and I've never
>> heard of it.  Can anyone tell me something about it?  Thank you.

The plant known in the UK as Japanese knotweed is:-

Fallopia japonica (synonyms Reynoutria japonica, Polygonum cuspidatum)

It forms quite dense thickets, up to 2m high and is certainly a problem 
weed here!

It spreads by regrowth from vegetative fragments, rather than seed. It is 
difficult to get rid of, but I believe this can be achieved using lots of 
herbicide.

Dunmail
Unit of Comparative Plant Ecology
University of Sheffield