By Casso
Kent,
United Kingdom 
This is growing in one of my patio pots. I don't remember planting it so is it a weed? Here is another photo of it.
23 Jun, 2011
Answers
Nice bricks though! :-)
23 Jun, 2011
It looks like willow herb I get a lot self seeding from the fields in my garden, I just pull it out.
23 Jun, 2011
Yep, it's a weed.
23 Jun, 2011
Thank you Beattie.
24 Jun, 2011
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Can't tell what it is, the pic's too blurry
23 Jun, 2011