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Book cover - Common Weeds of New ZealandAn Illustrated Guide to
Common Weeds
of New Zealand

 

Hedychium gardnerianum
Kahili ginger

Family ZINGIBERACEAE

Reproduced from
Common Weeds of New Zealand
by Ian Popay, Paul Champion & Trevor James
ISBN 0 473 09760 5
by kind permission of the
New Zealand Plant Protection Society

Publication or other use of images or descriptive text on these pages is unauthorised unless written permission is obtained from the authors and publisher.
Appropriate acknowledgement of the publication Common Weeds of New Zealand must always be given.

Available from Touchwood Books

Hedychium gardnerianum - Kahili ginger Hedychium gardnerianum - Kahili ginger

Fragrant, leafy, rhizomatous, semi-tropical perennial herb up to 2 m tall, with magnificent display of large, conspicuous yellow flowers in late summer, followed by scarlet seeds in capsules. Major problem of conservation areas in Auckland and further north.

  • Flowers Pale lemon-yellow with conspicuous red stamens, fragrant, in large open inflorescence 25-45 cm long. The narrow bracts do not overlap, and each envelopes two flowers. The corolla tube is about 5 cm long, with a two-lobed labellum. Flowers Feb-Mar.
  • Fruit Three-valved capsule, 15-18 mm long, orange on the inside, containing numerous bright scarlet, shining seeds, each 6 x 4 mm.
  • Leaves Lance-shaped, 20-45 cm long by 10-15 cm wide, short-stalked, tapering to a point.
  • Stems Leafy, erect.
  • Roots Large tuberous rhizomes.

Habitat

Road-sides and damp places.

Distribution

Common in North Auckland, very common in and around Auckland City, common in Coromandel Peninsula, Kawhia, Bay of Plenty, Opotiki, and Gisborne City, and in Nelson-Buller area in SI. Originally from South Africa.

Comments

Listed on the National Pest Plant Accord (see Introduction for details).

Related species

Yellow ginger (Hedychium flavescens) is somewhat taller, up to 3 m, with off-white to cream flowers in a cone-like inflorescence, with the bracts strongly overlapping. Seed is not produced. Common in northern NI on road-sides, forest margins, stream-sides. This species is subject to a Pest Plant Management Strategy in Taranaki. Listed on the National Pest Plant Accord (see Introduction for details).

Derivation of botanical name

Hedychium (Gr.) = sweet snow, meaning the fragrant white flowers of some species; gardnerianum after Edward Gardner, political resident in Nepal.

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Web-notes: Weed Links

On this site

Reproduced from Common Weeds of New Zealand:

External Links

WeedbustersWeedbusters New Zealand
Weedbusters is a weeds awareness and education programme that aims to protect New Zealand's environment from the increasing weed problem.
PestWebNZ™
A free tool to assist farmers and agricultural professionals in decision-making regarding weed and pest identification, biology, impact and management.
Weed keyNew Zealand Weeds Key
An interactive identification key to the weeds of New Zealand. Developed at Landcare Research.

New Zealand Plant Conservation Network naturalised plants
Search for information on more than 2500 naturalise and weedy plants.
NZ Plant Protection SocietyNew Zealand Plant Protection Society
Their main objective: "To pool and exchange information on the biology of weeds, invertebrate and vertebrate pests, pathogens and beneficial organisms and methods for modifying their effects."
 
Massey UniversityMassey University Weeds Database
A site providing information about New Zealand weeds and weed control. It has a series of pages showing pictures of New Zealand weeds, notes on identification and control. It also provides information on a university paper entitled Controlling Weeds.
 

 
 
 
Weeds in Australia
Weeds website of the Australian Government.
Weed Society of Victoria
Promoting wider awareness and interest in weeds and their management. Includes a useful page of links to other weed societies.
 
Tamar Valley Weeds Strategy
Listing of common and botanical names, images, and information including control methods for weeds found in Tasmania, and also weeds of national significance.
 

Invasive and Exotic Species of North America
Images and other information from the University of Georgia.

World of Weeds
Weed-related resources including weed science, practical tools, gardening tips about controlling weeds, and environmental news updates.
 
Invasive Species Specialist Group
"The ISSG aims to reduce threats to natural ecosystems and the native species they contain by increasing awareness of invasive alien species, and of ways to prevent, control or eradicate them."
WeedScience
Site that includes a comprehensive collection of weed images from around the world.
 


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Last updated: July 13, 2014