Answer: There are several plants to try that would stay low and grow between rocks. Some to consider would be the various forms of creeping and wooly thymes, mazus reptans, and the old standby, the creeping sedums. Wooly thyme and mazus would do well in shadier areas, the thymes and sedums in more sun, so you might experiment a bit depending on the lighting conditions you have to offer. They are all very hardy.
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