Sloping sites can present real problems including runoff and erosion. It can also be challenging to find ways to use this property. Sites like this can really benefit from the construction of a retaining wall to provide more level planting and recreation areas. Colorado or granite boulders can be creatively stacked and built at a lower angle back into the slope to ensure stability. Little planting pockets can be created to plant a living wall; sedums and rock garden plants work great in this application. Hardscape elements are very important and creating a theme. A Colorado garden theme looks complete with multi-colored Colorado river boulders and pinkish-rose flagstone. A recirculating garden stream flowing on a hillside will help too!