Answer: Sagina subulata, commonly called Irish Moss, or Scotch Moss, is a possibility. It takes full sun and regular water, but although it's called moss, it doesn't require the woodsy environment associated with a moss. It needs good drainage and can take some foot traffic. Or, creeping Thyme is a plant you might consider. It's low growing and will be happy between the flagstones. Hope these plants work well for you.
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