Kahili Ginger or Ginger Lily, Hedychium gardnerianum, is fairly widespread on Springbrook and can be readily seen along roadsides. It has been recognized as one of the "world's 100 worst invasive alien species" by the IUCN Invasive Species Specialist Group (ISSG).

Kahili Ginger, native to the Himalayas, belongs to the family Zingiberaceae as does the native ginger, Alpinia. It can grow to a height of 2 metres and can spread vegetatively from rhizomes which can form a bed up to a metre thick. Its seeds are spread by birds attracted by the bright red fleshy seeds.

Kahili Ginger can rapidly grow into dense thickets displacing understorey plants in the rainforest and preventing the regeneration of all trees, plants, and fern in the forest. Once established it is difficult to remove.

Thanks to the persistence and determination of Brian Phillips, Kahili Ginger is now listed as a Class 3 Declared Plant in Queensland. This means it cannot be sold in nurseries and should be eradicated where it occurs on land adjoining environmentally significant areas such as national parks.

The plant is a serious pest in Hawaii where it has invaded rainforests endangering the biodiversity of some of the most pristine native rainforests in Hawaii.

Kahili Ginger is also a serious pest in New Zealand.

Control
Control of Kahili Ginger is difficult as even small rhizome fragments can resprout. It is susceptible to glyphosate treatment but followup treatment is essential.