Grasses & sedges are versatile plants that play an important roll in any garden or yard. They can add interest through color, texture, and height variation all while providing shelter for birds and insects and preventing soil erosion. For gardens with water sources, sedges are also a great way to provide filtering of runoff before reaching the pond.
There are differences between grasses and sedges, botanically speaking, but their functionality is similar, so they tend to get lumped together. As a group, grasses and sedges provide a wide range of options for any garden.