Kebnat
PLANTS

Giant ragweed

Ambrosia trifida

Plants
NativeHerbAnnual
Giant ragweed, photo 1 of 5
Giant ragweed, In flower
Giant ragweed, In fruit

Annual herbaceous plant. Grows in fields and near water.

There are 185 observations of Giant ragweed in Québec, mostly in Montérégie, Montréal and Lanaudière, and it has been reported in 14 of the 17 regions. They peak in August and become rare from October to May.

Through the year

JFMAMJJASOND

Where to see it

  1. Montérégie66
  2. Montréal32
  3. Lanaudière17
  4. Abitibi-Témiscamingue17
  5. Capitale-Nationale15
  6. Saguenay–Lac-Saint-Jean11
  7. Laurentides6
  8. Estrie6
  9. Chaudière-Appalaches4
  10. Centre-du-Québec3
  11. Bas-Saint-Laurent3
  12. Mauricie2
  13. Outaouais2
  14. Laval1

Habitat

FieldsBoaz Yoffe B Sc
Water’s edgepeupleloup

Similar species

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RagweedAmbrosia artemisiifolia
Cutleaf coneflowerRudbeckia laciniata
Perennial ragweedAmbrosia psilostachya
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Culver's rootVeronicastrum virginicum
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Poison ivyToxicodendron radicans
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PokeberryPhytolacca americana
MugwortArtemisia vulgaris