Stop the Phragmites?

[u/Last13th]

We have a marshy area behind our house, covered in phragmites. My property line actually sits about six feet into the phragmites (which we actually like), but I’m trying to reclaim 3 or 4 feet, so we can put a fence in (we got a new puppy). I’ve started cutting it back, but of course, next spring it’ll come back. Is there a good was, minus chemicals or salt to stop it? If I seed or sod the cut back area, and just make sure it stays cut, will I eventually gain some control? And if so, would I seed/ sod now (mid-October), or wait until spring? We are in northern Delaware.