In your zone, cool season grasses and sedges (sedges are not grasses) have two short growing seasons per year; spring and fall. They are semi-dormant in winter and summer.

I would expect them to be a little bit larger after two full years, but they really don't start to pop until that third year.

Thanks donn, I thought I had remembered reading that on this site, but wasn't sure. I didn't know sedge was not a grass, thanks.

Katrina, your post reminded me of a saying I heard once about ornamental grasses: the first year they sleep, the second year they creep, and the third year they leap. So, just be patient a little longer :)