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Dr. Leana Wen: The most common culprit is a plant called ragweed. Ragweed grows wild just about everywhere in the United States. One plant can release 1 billion grains of pollen. Ragweed season ...
Ragweed pollen can remain airborne for days and travel great distances, and can even be carried 300–400 miles (500–600 km) out to sea. [12] Ragweeds native to the Americas have been introduced to Europe starting in the nineteenth century and especially during World War I , and have spread rapidly since the 1950s. [ 15 ]
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Ambrosia trifida, the giant ragweed, ... This is an annual herb usually growing up to 2 m (6 ft 7 in) tall, but known to reach over 6 m (20 ft) in rich, moist soils. ...
A honey bee collecting nectar from an apricot flower.. The nectar resource in a given area depends on the kinds of flowering plants present and their blooming periods. Which kinds grow in an area depends on soil texture, soil pH, soil drainage, daily maximum and minimum temperatures, precipitation, extreme minimum winter temperature, and growing degre
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Ambrosia chamissonis is a species of ragweed known by the common names silver burr ragweed, silver beachweed and (silver) beach bur(r). [ 3 ] It is known from most of the coastline of western North America from Alaska to Baja California , where it is a resident of beaches and other sandy coastal habitats.
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