Annual ragweed
Ambrosia artemisiifolia L.
- light
- Full sun
- water
- —
- tall
- 1.1 m
- wide
- 1.1 m
Asteraceae
Also called Roman wormwood
Formerly Ambrosia chilensis, Ambrosia diversifolia, Ambrosia elata, Ambrosia elatior, and 5 more
When it flowers
Not known yet in the tropics: too few flowering observations to read a season from.
If a child, a pet or anyone may have eaten a plant, contact a doctor or vet straight away, or call the National Poisons Information Centre (AIIMS, New Delhi) on 1800 116 117, free and open 24 hours.
Something wrong with it?About it
- Grows as
- Annual or perennialKew's checklist, not yet checked
- Climate
- TemperateKew's checklist, not yet checked
- Wild in
- Subarctic America to U.S.A.Kew's checklist, not yet checked
- Light
- Full sun (6 h or more)Read from NC State Extension, one source
- Height
- 30 cm to 1.8 mRead from NC State Extension, one source
- Spread
- 91 cm to 1.2 mRead from NC State Extension, one source
- Flowers
- Yellow, green, brownRead from NC State Extension, one source
Not known yet: water, coldest it survives, heat, hottest it survives.
In other languages (7)
- Czech
- ambrozie peřenolistá
- Simplified Chinese
- 豚草, 豕草
- German
- Beifuß-Ambrosie
- Finnish
- marunatuoksukki
- Canadian French
- petite herbe à poux
- Chinese
- 瘤果菊, 豚草, 豬草
- Slovenian
- pelinolistna žvrklja
Where this comes from
- Wikidata, read 2026-10-25, CC0-1.0
- Kew's checklist, read 2026-10-24, CC-BY-4.0
- NC State Extension, read 2026-10-25, fact, cited
- Wikimedia Commons, read 2026-10-25, CC BY-SA 3.0
- 3D model: Ambrosia artemisiifolia (built for Vanagrha) by Vanagrha, own
A fact “checked by a majority of its sources” was settled by a vote of the pages it was read from, not by a person reading it; one marked “one source” rests on that page alone. Anything else not marked checked has not been checked yet. Where nothing is known, the page says so rather than guess.