Answer: That type of growing location is usually very hot and dry because of all the reflected heat combined with the slope. You might consider some of the following plants as ground cover: low mat-forming varieties of juniper, creeping thyme, lower growing sedum varieties, or creeping phlox. If you don't mind a slightly taller planting, you might consider the dwarf barberry, a mid-height juniper, or perennials such as purple cone flowers, perovskia, or artemisia. No matter what you plant, however, you will need to prepare the soil by adding copious amounts of organic matter to it and then water the new plants until they become established. Remember to water deeply but less often rather than a daily light sprinkling. Using several inches of organic mulch will also help reduce the watering need in addition to cutting down on the weeds while the plants are settling in.
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