Answer: Arenaria montana (sandwort) forms dense mats that are mosslike. It is used as a lawn substitute or between stepping stones, growing 2-4 inches high. It takes full sun and regular water. Scotch heather (Calluna vulgaris) has dozens of varieties, some of which are only a few inches tall, such as 'Dainty Bess' or 'Mrs. Ronald Gray.' Check with your local garden center for varieties. Creeping thyme and wooly thyme are other possibilities.
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