The guy who replaced our lawn never thought to tell us to order a skip for the old stuff, so the old turfs were put in an empty border. The piles are heading towards 2.5 feet high, and of course, they have sprouted. How on earth can I kill offf the grass. I've nothing planned to plant in the border for a while, but I just overwhelmed ( as well as very angry) right now. I would appreciate your suggestions.
Spray the unwanted grass with an herbicide.
Or hire someone to remove the piles.