I have to dig it up. It roots deeply and even if you leave a small piece of root with no top on it, it will regrow. It has like bracts along it that each will root down and grow. Besides that the grass has been here for years and the seeds would just re-sprout and take over even if the other was smothered. Why on earth anyone would plant this stuff on purpose is beyond me. I do know it is an illegal invasive in some states. I suppose the weather and soil types make a big difference in its performance.
