Answer: Bougainvillea is a tropical plant and it is frost tender. I live in zone 9 (Phoenix) and bougainvillea will suffer freeze damage here! However, you can grow them in a pot and bring them inside for the winter. Be careful to monitor weather forecasts for early frosts in the fall or late frosts in the spring! On the positive side, they do recover from frost damage as long as the root system is still viable.
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