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Ambrosia artemisiifolia L.
Annual ragweed, Short ragweed
USDA Symbol: amar2
Coarse, hairy-stemmed annual with inconspicuous flowers in elongated clusters.
This plant, not Goldenrod, is a cause of hay fever, recognized by all who suffer the discomfiting allergy. Pollination is by wind, as indicated by the drabness of the flowers, which do not attract insects. The best control is to permit perennial plants to crowd this annual out. Since the seeds persist into winter and are numerous and rich in oil, they are relished by songbirds and upland game birds.
Plant CharacteristicsDuration: Annual Habit: Herb Fruit: Size Class:
Bloom InformationBloom Color: Green , Brown
Bloom Time: Jun , Jul , Aug
, WY Canada: AB
, SK Native Distribution:
Throughout North America, except far north. Native Habitat:
Grows profusely in open mixed grass praries and roadsides. Native
to North America although they are also found in Eastern Europe.
Growing ConditionsLight Requirement:
Sun , Part Shade , Shade Conditions Comments:
Considered an invasive plant. In
gardens ragweed can be contained by hoeing or hand-weeding young plants. It propagates mainly by rhizomes but also by seed. Ragweeds unleash copious amounts of pollen into the wind. So those prone to hay fever watch out.
BenefitUse Medicinal: Tea from leaves applied to swellings, taken to stop vomiting and bloody stools
Warning: Plant parts can cause skin irritation if touched.
Conspicuous Flowers: yes
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Herbarium Specimen(s)NPSOT 1115
Collected Oct 12, 1994 in Bexar County by Harry CliffeNPSOT 0547
Collected Oct 4, 1987 in Bexar County by Harry Cliffe
Record Last Modified: 2012-06-20
Research By: NPC