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Bureau of Air Quality
How to Identify the Ragweed Plant
Scientific Name: Ambrosia artemisiifolia
Height: 1 to 5 feet
Stems: green, hairy
Leaves: divided into narrow segments, each irregularly
Flowers: 2 to 4 inch long terminal spikes of green to yellow
- There are 17 species of ragweed in North America.
- Ambrosia is the generic name of ragweed and in the Latin means
"food of the gods."
- Ragweed grows the best in sunny, newly-disturbed soils, free
from competition with other weeds and grasses. It is often found
along roadsides, vacant lots, river banks, and abandoned fields.
- Ragweed starts blooming in Pennsylvania in mid-August as the
days become shorter and the nights longer. Pollen production ends
mid-September as temperatures start dropping below 60 °F.
- It is estimated that one ragweed plant can produce up to 1 billion