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

 

Achillea millefolium
yarrow

Family ASTERACEAE

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

Achillea millefolium - yarrow

Erect or mat-forming, rhizomatous, pleasant smelling perennial with feathery leaves, often forming extensive patches on cultivated ground or in grassland. White or occasionally pink flowers in heads in clusters at the top of flower stalks, often about 50 cm high. Very common in pastures, along road-sides and in waste places.

  • Flowers Individual flowers white, sometimes pink or reddish, 5-10 mm in diameter, composite, with four to seven white, pink or red ray florets and ten to twelve creamy disk florets. Flowers arranged in dense, flat-topped, terminal compound corymbs up to about 15 cm across. Flowers Dec-May.
  • Fruit Greyish flattened achenes (seeds) 2 mm long, with narrow pale brown wings and no pappus hairs.
  • Leaves Feathery, dark green, stalked, lance-shaped basal leaves up to 15 cm long by 2 cm wide, two- or three-times pinnate. Stem leaves smaller and less divided.
  • Stems Erect or curved upwards at the tips, leafy, finely-furrowed, downy further up.
  • Roots Fibrous, arising from nodes on the rhizomes.

Habitat

Arable land, pasture, waste areas, road-sides, railways, industrial sites, lawns, marshy and coastal places.

Distribution

Common throughout NZ and the offshore islands, especially in drier areas. Originally from Europe, Caucasia, Iran, Siberia and the Himalayas.

Comments

A very widespread weed and component of pastures. It used to be sown as a drought-tolerant pasture species and is readily grazed by stock. Since the time of Achilles, yarrow has had a reputation for healing wounds. It also has a number of other medicinal uses, including treatment of fevers, muscular ailments and respiratory complaints.

Derivation of botanical name

Achillea (Gr.) = after the hero Achilles, said to have used it medicinally; millefolium (Lat.) = thousand-leaved, a reference to the finely divided leaves.

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