@SrRochardBunson I've used the sterile variety and it's still absolutely a permanent planting. Don't dig near it, don't try to move it, just plant it where you want it and hope nobody ever tries to remove it, or you'll have a freaking field full of it.

It will grow from the tiniest sliver of a root, so don't even knick it or you'll have another plant whether you like it or not.

Things growing near it will get bigger, faster. You'll get a bunch of green matter for chop and drop several times a year. It doesn't seem to be any more effective at that job than grass clippings, in my experience. I had much better results using arborists' wood chips.