Answer: It is very difficult to establish a planting in such a tough spot, so your choices will be somewhat limited to plants that can withstand not only a hot dry location in full sun but also grow on a bank. Watering is critical to successful establishment of any planting, and this is made more difficult by the slope. The most "tailored" look I can think of would be provided by low growing, mat forming, spreading junipers. They are also extremely low maintenance once established.
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