yarrow??

Is this yarrow?

looks like it to me...

Yes it is Yarrow, a very lovely and useful plant.
http://wildflower.org/plants/result.php?id_plant=ACMI2

I have some rather old Yarrow cultivars, Cinnamin and some just white. They are kind of weedy looking, but they pay for the space they use as they make a nice tea, and have many medical properties. They aren't as nice looking as they were back when I took this photo.

Absolutely yarrow.

Thanks everyone :o)