This is two grasses, Juncus inflexus and Juncus spiralis, growing together for color and form contrast. In your climate, you could get by with just a couple of hours of sun a day, or all-day dappled shade. The key to them is moist soil. The more sun, the more moisture required.

Great. Actually I broke the one I have up into about 10 smaller pieces to put in different places to see where it will grow best. It did look to me that it was a bunch of individual plants grown together (I think I will look for the spiralis in the future.) And will this be a perennial?