Pure switchgrass makes great cover, but it gets so thick that small game birds and turkeys can't go through it. It best mixed with other grasses and forbs which provide variety and browse as well. DNR around here had many acres of pure switch. They nuked it all and replanted with a mix. Now we've got deer and turkeys nesting in it. The deer are using it for browse in the spring. Some of those native forbs are the first thing to green up. A lot of fawns get born in the grass as well.