Juncus inflexus 'Blue Arrows' (Rush)
Tough as nails, semi-evergreen perennial for full sun. The foliage of this plant is narrow stiff blades that form large masses in a bright blue/green color all year long. A great perennial grass for containers! At Yew Dell you an check out some nice specimens of this plant below the Gheen's Barn near the Stone Terrace.