You might be wondering about Blue Sedge.
In general, Sedge looks like an ornamental grass and it is used that way in landscaping. In fact, it is not a grass when you classify it in the science world. The Sedge family of plants is different than grasses or rushes and has a triangle cross-section. Blue Sedge has a blue-gray hue and is found in the Midwest and East, in the States. It is actually native to Europe and North Africa. It is a hardy plant that is adaptable. According to the University of Illinois Extension Service, it can handle a variety of soil conditions. You can find more details here.
For even more information on the plant world, the USDA PLANTS database can be found here.
Photo: University of Illinois Extension Service