This is Alpinia galanga, also known as Greater Galangal, Siamese Ginger, False Galangal, blue ginger, Thai ginger, and Spice Ginger. This is a major food ingredient in Thai and Indonesian cooking. The plant grows about 6 feet high and has a red fruit. The plant grows and spreads through its own rhizome, which is its roots. These roots are what is widely used in cooking. An oil taken from the rhizome is used to make some sodas and the alcoholic beverages named Angostura and Chartreuse among others. USDA Hardiness Zones 8 to 10.