This client had a small backyard that include a steep hill. She loves planting and had to climb up the muddy hill in order to plant. Having a bird sanctuary was also very important for her. We decided on a natural look with a boulder wall, perennials and bird loving flowers, shrubs and trees. Boulder walls rely on the weight of the rocks to hold themselves together. But, we also add gravel behind and below to make sure water does not undermine the wall.