Answer: The conditions you describe are definately for only the hardiest of plants. Portulaca (Moss Rose) is such a plant, and it comes in the colors you seek. Some species of sedum and Livingstone Daisy are succulents that would also do well. Other annuals thatmight do: marigolds, nasturtiums, Eschscholzia (California poppy), and Helipterum (Everlasting Flower). To help the soil maintain some moisture in these conditions, work in a bit of peat moss or compost, and mulch the soil surface. This will also reduce reflection.
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