Each plant is be able to produce about a billion grains of
pollen over a season.
Ragweed is normally
1' - 7' ft. in height and is
found throughout the United States. The
weeds are most commonly found in the Eastern states and the Midwest.
produces abundant pollen that is a
primary cause of hay fever. Ragweed
pollen can travel far. It has been measured in the air 400 miles out
to sea and 2 miles up in the atmosphere, but most falls out close to
Common Ragweed is the most widespread of this genus
in North America. It normally attains a height of about 3' ft.
Ragweed grows the best in warm and 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.
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