I tried them in Iowa a few years ago and liked them. I've tried growing them here in the Ozarks, but I can't get them to germinate.
I don't want to send you to Oklahoma but read this thread. It says it is important to have fresh seed and that it is not very fast about coming up.
Here is a link that might be useful: OK forum thread for you to read
Thanks! The Okies have given me a complete answer.