I have a grass taking over my flower beds. Really thin long runners like gets to several feet long. Seems to come in the front and back under weed barrier and travel across the whole thing and works like a vine reatching itself in the middle. Roundup 365 won't kill all of it to root seems to kill parts it touches but then recovers. Is there anything I can get that will kill this stuff dead.

It is kind of crazy only affects part of one large bead none of the other beads get it.

Mix it stronger. Round up should kill most things and the premix versions sometimes need more added.

Grass-b-gon is awesome for this.