wall for drop of 3ft or verge? The garden slopes down from a main highway separated by a hedge. I would need to drop the height of the garden by the hedge by 3ft to level it with the rest of the garden. Will this require a supporting wall or can it be a grass verge? I'm not sure how much rock is below the grass but know it's a limestone area. Is this easily dug out? Any help would be great please.