Answer: Congratulations on your success so far! You will want to move them to a cool, sheltered area just as you would your eventual bonsais. Frost will not hurt them but you definitely do not want to freeze the roots. You need to store them for the winter in a location where temperatures stay slightly above freezing (35 to 40 degrees F) so the plants can undergo a winter chilling period without freezing the rootball. During storage water sparingly, just enough that the roots do not dry out completely. Then in the spring, take them back outside so they can wake up naturally with the season. Good luck!
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