Stone Walls and Steps Native boulder retaining wall with solid stone steps blending in. Autumn in the garden can be spectacular. Dry stack retaining wall with a natural curves to retain the natural slopes. Crisp corners of a stone wall speak of fine craftsmanship. Colorful planted slope off patio edge. A stone seat wall creates an intimate gathering area. Mossy rock steps lead to a native garden. Mountain garden patio side. Dry stack / mortar back retaining wall