State Museum of Natural History
Biodiversity Data Centre

Ambrosia artemisiifolia L.

  • Ambrosia elatior L.
Vernacular Name
Common Ragweed, Annual Ragweed, Low Ragweed, American Wormwood, Bitterweed, Blackweed, Carrot Weed, Hay Fever Weed
Conservation status
No status defined
Value of species
Occurrence: [nAb(A), aAg, -Al, Ar, nAu(A), aAu(L), Be(B), aBe(L), aBH, Br, nBu, nBy, aCo, nCs, aCt, Da, nEg, aEs, Ga(C), nGa(F), nGe, nGg, Gr, aHb(E, N), He, Ho, nHs(S), nHu, aIs, nIt, nJu, aLa, ?Li, Lt, nLu, nMd(M), nMo, No, nPo, nRf(C, CS, E, N, NW, S), Rf(K), nRm, nSk, aSl, nSr, nTcs, Tu(A), Uk, nUk(K, U)] (EuroMed, 2018). A species of the genus Ambrosia native to regions of the Americas. The species name, artemisiifolia, is given because the leaves were thought to bear a resemblance to the leaves of Artemisia, the true wormwoods. The plant is native to: North America across Canada, the eastern and central United States, the Great Plains, and in Alaska; the Caribbean on Cuba, Hispaniola, and Jamaica; and South America in the southern bioregion (Argentina, Chile, Paraguay, Uruguay), the western bioregion (Bolivia, Peru), and Brazil. The distribution of common ragweed in Europe is expected to expand northwards in the future. Ambrosia artemisiifoliais an annual plant that emerges in late spring. It propagates mainly by rhizomes, but also by seed. Its bloom period is July to October in North America. Its pollen is wind-dispersed, and can be a strong allergen to people with hay fever. Common ragweed, Ambrosia artemisiifolia, is a widespread invasive species, and can become a noxious weed, that has naturalized in: Europe; temperate Asia and the Indian subcontinent; temperate northern and southern Africa and Macronesia; Oceania in Australia, New Zealand, and Hawaii; and Southwestern North America in California and the Southwestern United States. Common 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 seeds in the small grain stubble. Its wind-blown pollen is additionally highly allergenic. As of 2014 the ragweed leaf beetle, Ophraella communa, has been found south of the Alps in southern Switzerland and northern Italy. Many of the attacked plants were completely defoliated. Zygogramma suturalis was introduced to Russia, and then China, for ragweed control, with very positive initial results. Ambrosia artemisiifolia was a traditional medicinal plant for Native American tribes, including the Cherokee, Lakota, Iroquois, Dakota, and Delaware.
Book reference
  • Кузярін О.Т. Судинні рослини території торфовища "Білогорща” (м. Львів) // Наукові основи збереження біотичної різноманітності. - 2010. - Т.1(8), №1. - С.75-90.
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  • Alexander KUZYARIN, Dr, e-mail:

Taxonomic branch

Asteraceae (=Compositae)