Looks like Luzula sylvatica, Forms a nice clump and very good ground cover and weed supressant.
But then I may stand corrected.

It certainly does look like it 2nd hand ...one i've never even heard of but sounds ok :-))

I had a small plant similar to the size of the photo, within 3 years, I had enough to do the hair on humph.

http://www.growsonyou.com/photo/slideshow/241501-humph-has-matured/member/2ndhand