Solved Any idea what this is?

This is growing in a wooded hedge bank, I thought it was balsam at first but the leaves are alternate and looks like it's going to have pink frothy flowers, it's a few feet tall, and looks like it wants to go higher, it has a ribbed stem, slightly hairy leaves with no serrations?
Thanks Dan

 

Looks like Polygonum sp.
Please add pic showing flowers.

https://www.google.co.uk/search?q=p...G4bSU7uwgdgI&ved=0CAcQ_AUoAQ&biw=1536&bih=728

 

I wondered if it was that family, the flowers aren't out yet, you can see one of the buds. Stems are hollow and it's in a damp spot. It's on our neighbours side of the hedge bank, but I think we're going to have to work together to eradicate it.

 

Here's a better pic any idea which variety it is? I can't seem to find a similar on on Google

 

Could be P. tinctoria?????

 

Polygonum and Persicaria seem to swap names.
I am not familiar with Persicaria tinctoria..definitely a possible.

http://www.7wells.co.uk/persicaria-tinctoria-polygonum-tinctorium-103-p.asp

The only other one I thought of is Persicaria campanulata which is found in Devon...never seen it with tight buds . Could be miles out!

http://www.aphotoflora.com/d_persicaria_campanulata_lesser_knotweed.html

 

I'm hoping it's not polystachyum, the flowers should be out better in a day or so, which will help.

 

Some more pics, I'm thinking campanulata? It's also easy to pull ans seems to have fairly shallow roots?

 

Thanks for new pics.

Still looking good for Persicaria campanulata.

http://www.aphotoflora.com/images/p...nulata_lesser_knotweed_flowers_05-08-10_1.jpg

https://www.google.co.uk/search?q=P...a=X&ei=8meKVcudBeW17gaPjrfIDg&ved=0CAYQ_AUoAQ

It is beautiful and is actually sold as a garden plant by such nurseries as Bluebell nurseries in the Midlands..
But can spread to form large patches.

http://www.bluebellnursery.com/catalogue/herbaceous/Persicaria/P/1976