I have bought a house that has been left unoccupied for a long time. The garden was once lovely but sadly left to over grow. It's a cottage style garden with a mixture of shrubs and herbaceous perennials. I started by cutting back hard last year and to my surprise it's come back great but I have a big problam with rye grass in the borders. Itr's perticully difficult to remove from an area with geraium wargrave and mixed iris. Is there anything I can do. I really do not want to dig the border up and start again.