A few years ago when my work still demands me to periodically visit far regions in the country, i got some tubers of Hedychium coronarium from a roadside in Bohol. We call it kamya/kamia/camia, known for its subtle fragrance. I remember planting its tubers at the side of the garden with a little bit elevated land. I know the soil there is not as fertile as the rest of the garden, so thought it will lessen the height of these plants, if ever they will survive the dry season. Last year it produced a few dwindling flowers, maybe 2-3 blooms, but i didn't notice the scent that time. Then i forgot all about it. I didn't even check if they are still there behind profuse growth of the Hippeastrum hedge.
Yes they survived the last year's drought, and last weekend i was at home its presence was surely noticed. The sweet scent permeates the garden and mingled with us while we converged at the terrace. It was nicely situated on top of other plants with the whites visibly dangling like moths against the green background. That was a very delightful sight. I can forgive its invasiveness, promise!
Hedychium coronarium is both an ornamenta and medicinal plant of the ginger family. The young flower buds and flowers are reported to be eaten as food, while all the other parts of the plants are medicinal. It was said that it also has very high antioxidant properties. For some summary of the uses here is one of the references: http://www.stuartxchange.org/Kamia.html