Mint?? Just a guess.

Bit tall for mint I think. I also assume you mean 50cm in height rather than 500cm which is 5 metres. It reminds me of something but I can't think what right now!

i have stacks of them - i am pulling them out daily - i'd like to know what they are too!

Himalayan balsam?

Gosh you could be right Cammomile and I hope you aren't :-)

I have been pulling this up as well. The roots seem to go for miles.Are these really bad MG ?

Hi Jenfren well Himalayan balsam is a serious thug of a weed - check out this info from the RHS (no I'm not being lazy they explain it better than I can!)

Copy and paste url into your web browser

http://apps.rhs.org.uk/advicesearch/profile.aspx?pid=480

Have looked on RHS site thanks MG. Dont think this is same weed as flower doesnt look right

it seems very easy to pull up and is incredibly prolific....

Bulba says if max. height half a metre not Himalayan Balsam and seems to think it is a burn, stream, riverside weed - given he is ex. SEPA he is probably right :-)

We have balsam in park nearby and im sure the leaves are smoother on balsam, the action of the seed pod is amazing ....slightest tap
And... Boom!

No doubt I will get my wrists slapped here, but I had a plant that looked similar. It grew amongst some real thuggish verbascum chiaxii alba that I had. It resembles what was identified on here to me as a figwort.

http://www.growsonyou.com/question/show/45534

It's definately not himalayan balsam, the leaves are all wrong.

Why would anyone slap your wrists 2ndhand? You've come up with a positive i.d. - that gets a 'well done' in my book not slapped wrists :-)

:-)