Hetty, some of my plumerias are under lights from October to April/May. From April/May 'til October they're growing and flowering outdoors. It's known by now that plumerias don't need a tropical sun to flower outdoors as the following pictures show.
My Samoan Fluff flowering OUTDOORS in Chicago >>>
My India flowering OUTDOORS in Chicago >>>
My Lurline flowering OUTDOORS in Chicago >>>
Plumerias grow and flower OUTDOORS as far north as Fairbanks, Alaska, during the summer months if proper growing conditions are provided.
Following is a picture of one plumeria flowering OUTDOORS in Fairbanks, Alaska >>>
