Answer: Phlox like some partial shade, though they can withstand full sun if they are in a moist, rich soil. Here are some other ground covers that might be a little more forgiving of your harsh conditions: evening primrose (Oenothera spp.), potentilla (choose a ground-hugging species, such as P. verna), wooly yarrow (Achillea tomentosa), ajuga spp. (some can be invasive), or sunrose (Helianthemum nummularium).
I hope this helps.
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