Answer: To some extent it depends which particular plants you have. In some cases you can take tip cuttings and then overwinter a smaller "clone" of the original, keeping it in a big sunny south window. In other cases you can bring the plant into a cool location (eg 45 degrees, water only enough to keep the soil from going bone dry, and allow it to rest during the winter. Sometimes a friend with a greenhouse will keep them for you in exchange for cuttings next spring. Since the alternative is to lose them, it is usually worth experimenting to see what works for you. I hope this gives you some ideas.
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