Hedychium gardnerianum is a spectacular perennial plant with several flowers the effect is stunning with a scent almost overpowering. Flower heads are about a foot tall and some 6" across, yellow with red stamens on top of 5ft stems.

Best to treat it as an annual in colder climates and plant close to a warm south facing wall with a protective mulch in winter, but they may not survive heavy frosts. The alternative is to dig them up and keep in a frost free greenhouse or conservatory over winter. 

Soak seeds overnight and sown indoors in good quality seed compost about 1/8th inch deep. Germination in about 4 weeks, but can be erratic.