Answer: In my experience, it is better to plant it outside in a sheltered location (with a wire mesh barrier around it to protect it from rodents and from being stepped on accidentally) and mulch around it well in late fall once the ground has frozen. I would plant it now, in September so it has some time to root before the soil cools down. Alternatively, you could keep the pot in a cold frame. I would not suggest keeping it inside for the winter. Enjoy your styrax!
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