Posted: 18/02/2014 at 16:55
I agree with Nut, most likely to be Geum urbanum, Herb Bennet. Geum rivale (Water avens) has peach-coloured flowers and would be less likely as a garden weed. Herb Bennet doesn't mind wet or dry conditions. As it's a perennial, I wouldn't put the roots on a compost heap.