Answer: If it is in rocks rather than soil you can simply keep the water level right at the rock level. It is basically growing in water and the rocks are anchoring it in the container. The roots will grow around the rocks to help keep the plant upright. You don't need to repot it. Just keep the water level at or slightly below the rock level. Every couple of weeks you can pour out the old water and refill with fresh water. Lucky bamboo grows slowly so you should not have to repot the plant for some time. Enjoy!
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