Juncus inflexus "Blue Arrow" (Rush)
Juncus inflexus "Blue Arrow," or Rush, is ideal for the pool, pond, or bog, although it will also grow very well in a container. The narrow, stiff blue-gray foliage grows to about three feet in full sun. Zones 5-9. (Painting by Jacob Sturm, 1796 from Wiki Commons and in the public domain). Quarts.