Posted: 20/04/2014 at 06:51
There are no plants that will keep ivy and brambles at bay - it is all about management. The traditional management technique i.e. cutting back hard to the bank once in the late winter, will stop brambles taking hold and keep the ivy under control and the ivy will be kept short, it's roots will help bind the hedge together and it will give you the evergreen effect you want.
Growing the traditional wild plants and flowers which clothe Cornish and Devon 'hedges' - ferns, foxgloves, bluebells, red campion, toadflax, sorrel etc, will look gorgeous and be absolutely wonderful for wildlife. These will begin to grow each year after the hedge has been cut back.
It sounds wonderful.