Yarrow

Thank you! It is growing in a semi-improved meadow so It is most likely the common one! When I see it next I will have to get a shot of the leaves!

I would say you mean the most common one, Yarrow. Checking some links it seems that there are tons of other species of Achillea around, but yours looks really like the common one, Achillea millefolium. Please, verify!
http://en.wikipedia.org/wiki/Achillea_mi...