Sometimes bluestem grass is used as hay for horses. I got my horse a bag once but didn't buy it again because he refused to eat it. I'm not sure which type of bluestem grass it was though. I also found out later that if bluestem grass is harvested too late, it can't be used as hay because it becomes too difficult for the animal to digest. So maybe it was the grass I bought that was problematic. I might give bluestem grass a try again in the future as hay, but I will definitely buy from a different seller.