Plumeria are sensitive to the number of hours of sunlight each day. You can "force" them with a grow light in northern latitudes but it will start growing when it gets about 10 - 12 hours of light per day. It will be fine while there are long summer days, but may lose its leaves when the days get too short. Don't panic it will grow again the next summer. It is not uncommon to have to wait two years for flowers in northern latitudes.

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