Answer: As long as they are in pots, the root systems will be constricted and they will grow slowly. The key is to move them into larger pots before they become root bound, but not give them so much room that they grow by leaps and bounds. When you see roots coming from the drainage holes, it's time to repot. You can shave off an inch of the fibrous rootmass without harming the palm. Then replant into the same pot with fresh potting soil. When the roots again begin to escape through the drainage holes, move the plant up to the next container size and shave off an inch of roots before planting it in fresh potting soil. If you shave the roots annually and move the plant up to another sized pot every 2 years, you should be able to keep the palms small without compromising their health. Good luck with your palms.
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