Herbaceous perennial plants <2m tall. Large, branching rhizomes that form dense layers <1m deep. Large wax-covered, lance-shaped leaves. Has lemon-yellow flowers (Feb-Apr) with conspicuous red stamens; under full light conditions, <100 seeds produced per flowerhead.
Forest edges, plantations, road edges, streams, unfarmed land. Prefers open light-filled areas also readily grows under forest canopy. Large risk in lowland broadleaf & kauri forest.
Spread locally from rhizomes, which sprout annually. Also spread from rhizome fragments. Kahili ginger also spread by bird dispersed seed.
Forms dense colonies smothering native plants & preventing regeneration.
Maintain rolling front, eradication can be easily achieved. Don’t replant sprayed sites for 6 months.
1. Slash stems & dig out all rhizomes. Young seedlings can be hand pulled, taking care to remove strings of rhizomes.
2. Cut above pink “collar” at base & stump paint (1g metsulfuron/1L or Vigilant gel).
3. Spray dense patches away from roots of vulnerable species, spring - late autumn (5g metsulfuron + 10ml penetrant/10L).
Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.