Solved ID help please

This has appeared in my most problem patch of the border. Can anyone tell me what it is please, it's the one with the small pink flowers near the monarda. Please excuse the bindweed and various other weeds.
Don't think I'll ever beat this patch.

 

Pollygonum

 

Thanks for the speedy reply Just had a google, the common name knotweed scares me a little, we have just discovered the Japanese variety a short distance from this border. Is this just coincidence? Probably I'm guessing. Thanks again Scrungee

 

Japanese knotweed is Fallopia japonica. Polygonum is in the same family, but they are not connected in the way that concerns you.

 

Phew, thanks

 

Having said that, the weedy types of Polygonum are a bind to get rid of, the roots are persistent so any bits left in will re-grow.

 

Sorry of my life with that sectionIt's got bindweed, couch grass, nettles and brambles amongst others and on top of that it's heavy clay. Thanks for the heads up though

 

I suggest a bonfire!

 

That was supposed to say story of my life Blooming technology I didn't know how to change it
Thanks for the input Gwen Austin, it's a seriously bad corner.
We are in the process of buying the other side, hoping we can fight a better battle if we own the land
Who knows? We've already found j knotweed here
Sometimes feel like