Sheryl, it puts up inflorescenses that are around 30" tall. They look like wheat and are easy to cut off. I've had no problems with reseeding. I cut them to use inside in arrangements and so forth. Otherwise, it spreads by shallow underground runners that I have found fairly easy to pull if I do it in a timely manner. But it will definitely spread by those unless you pull it or otherwise contain it in the ground. Mine isn't contained and so far I haven't had a lot of problems with it although sometimes it does pop up in an unexpected place in that bed.
I am thinking I got it at Lowe's, but it has been two years so I'm not absolutely sure.
