We need to raise £10,000 from user donations to get our finances in balance. More >>>

Follow Us:

 

Ambrosia artemesiifolia - L.

Common Name Roman Wormwood, Bitterweed, Blackweed, Carrot Weed, Hay Fever Weed, Stickeweed, Tassel Weed, Wild Ta
Family Asteraceae or Compositae
USDA hardiness 4-8
Known Hazards The pollen of this plant is a major cause of hayfever in N. America[207, 222]. Ingesting or touching the plant can cause allergic reactions in some people[222].
Habitats Waste places in Western N. America[60]. Found in dry soils, it can become a pernicious weed in cultivated soils[235].
Range N. America - British Columbia to Nova Scotia and Florida. Locally established casual in Britain[17].
Edibility Rating    (2 of 5)
Other Uses    (1 of 5)
Weed Potential Yes
Medicinal Rating    (3 of 5)
Care
Fully Hardy Moist Soil Semi-shade Full sun
Ambrosia artemesiifolia Roman Wormwood, Bitterweed, Blackweed, Carrot Weed, Hay Fever Weed, Stickeweed, Tassel Weed, Wild Ta


http://www.hear.org/starr/
Ambrosia artemesiifolia Roman Wormwood, Bitterweed, Blackweed, Carrot Weed, Hay Fever Weed, Stickeweed, Tassel Weed, Wild Ta
http://www.hear.org/starr/

 

Translate this page:

You can translate the content of this page by selecting a language in the select box.

Summary

Bloom Color: Green. Main Bloom Time: Early fall, Late summer, Mid summer, Mid fall. Form: Upright or erect. Other Names : Annual Ragweed, Bitterweed, Blackweed, Carrot Weed, Hay Fever Weed, Roman Wormwood, Stammerwort, Stickweed, Tassel Weed, Wild Tansy, and American Wormwood.


Physical Characteristics

 icon of manicon of flower
Ambrosia artemesiifolia is a ANNUAL growing to 0.9 m (3ft) by 0.2 m (0ft 8in) at a medium rate.
It is hardy to zone (UK) 4. It is in flower from August to October. The species is monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and is pollinated by Wind.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.

Synonyms

A. elatior.

Habitats

Woodland Garden Cultivated Beds;

Edible Uses

Edible Parts: Oil.
Edible Uses: Oil.

An oil is obtained from the seed. It has been suggested for edible purposes because it contains little linolenic acid[61, 183]. The seed contains up to 19% oil[61], it has slightly better drying properties than soya bean oil[183].

Medicinal Uses



Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

Antidote;  Astringent;  Disinfectant;  Emetic;  Febrifuge;  Women's complaints.

The leaves are very astringent, emetic and febrifuge[222, 257]. They are applied externally to insect bites, rheumatic joints and various skin complaints, internally they are used as a tea in the treatment of fevers, pneumonia, nausea, intestinal cramps, diarrhoea and mucous discharges[222, 257]. Juice from the wilted leaves is disinfectant and is applied to infected toes[257]. A tea made from the roots is used in the treatment of menstrual disorders and stroke[222]. The pollen is harvested commercially and manufactured into pharmaceutical preparations for the treatment of allergies to the plant[222].

Other Uses

Disinfectant;  Oil.

There is some indication it has been used as a disinfectant and Oil.

Cultivation details

We have very little information on this species but suggest growing it in a sunny position in a well-drained soil. It has been suggested for commercial cultivation[61]. Some plants produce mainly sterile heads[60]. The pollen from the flowers of this species is an important cause of hay-fever in N. America[17]. Special Features:North American native, Invasive, Inconspicuous flowers or blooms.

Propagation

Seed - we have no details for this species but suggest sowing the seed in situ in April.

Other Names

If available other names are mentioned here

Found In

Countries where the plant has been found are listed here if the information is available

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

It is listed as a noxious weed in Illinois (common ragweed) and Oregon (ragweed)as a "B" designated weed. Ragweed is a very competitive weed and can produce yield losses in soybeans as high as 30%. Control with night tillage reduces emergence by around 45%. Small grains in rotation will also suppress common ragweed if they are overseeded with clover. Otherwise, the ragweed will grow and mature and produce seed in the small grain stubble.

Conservation Status

IUCN Red List of Threatened Plants Status : This taxon has not yet been assessed.

Related Plants
Latin NameCommon NameEdibility RatingMedicinal Rating
Ambrosia trifidaGiant Ragweed, Great ragweed, Texan great ragweed, Bitterweed, Bloodweed, Buffalo Weed, Horse Cane13

 

Print Friendly and PDF

Expert comment

Author

L.

Botanical References

60235

Links / References

For a list of references used on this page please go here

Readers comment

David Beaulieu   Sat Sep 30 2006

Also known as "common ragweed," Ambrosia artemesiifolia blooms at the same time as goldenrod, in late summer-early fall. Being by far the more conspicuous of the two, goldenrod has become the scapegoat for hay fever. But common ragweed is the true culprit.

Common Ragweed and Hay Fever Introduction to Ambrosia artemesiifolia, including pictures.

iank   Mon Oct 13 2008

"Decomposing Ragweed poisons the soil, stunting the growth of newly germinated Ragweed seeds, as well as those of other plants. Ragweed seeds are heavily fed upon by birds, especially sparrows." -Eastern Forests. A Field guide to birds, mammals, trees, flowers and more.

QR Code

What's this?

This is a QR code (short for Quick Response) which gives fast-track access to our website pages. QR Codes are barcodes that can be read by mobile phone (smartphone) cameras. This QR Code is unique to this page. All plant pages have their own unique code. For more information about QR Codes click here.

1. Copy and print the QR code to a plant label, poster, book, website, magazines, newspaper etc and even t-shirts.

2. Smartphone users scan the QR Code which automatically takes them to the webpage the QR Code came from.

3. Smartphone users quickly have information on a plant directly for the pfaf.org website on their phone.

Add a comment

If you have important information about this plant that may help other users please add a comment or link below. Only comments or links that are felt to be directly relevant to a plant will be included. If you think a comment/link or information contained on this page is inaccurate or misleading we would welcome your feedback at admin@pfaf.org. If you have questions about a plant please use the Forum on this website as we do not have the resources to answer questions ourselves.

* Please note: the comments by website users are not necessarily those held by PFAF and may give misleading or inaccurate information.

To leave a comment please Register or login here All comments need to be approved so will not appear immediately.

Subject : Ambrosia artemesiifolia  
All the information contained in these pages is Copyright (C) Plants For A Future, 1996-2012.
Plants For A Future is a charitable company limited by guarantee, registered in England and Wales. Charity No. 1057719, Company No. 3204567,
Web Design & Management
This work is licensed under a Creative Commons License. Some information cannot be used for commercial reasons or be modified (but some can). Please view the copyright link for more information.