Need id--

Every time I take a trip to Nelson, Wisc/Waubasha,Minn in the fall( late Sept) I see this beautiful silvery-white seed heads of 3-5 feet tall Grass that grows along side of Wisc 35, and parts of Minnesota 61. Is this a "native" Grass?? where can I order some seeds or plugs??

thanks for any input;

tadeusz in Illinois.