One ragweed plant is capable of producing over a billion grains of pollen per season. In the U. S., it is estimated that ragweed produces 100 million tons of pollen each year!

Although there are several species of ragweed, most ragweed allergy problems are caused by two species which populate nearly every region in the United States:

Ambrosia artemisifolia
Ragweed

Also known as Short Ragweed. It can grow to be four feet tall. Blooms August 15th until first frost. Common cause of allergy when school starts.

Habitat - Fallow & waste fields, pastures, glades, roadsides, railroads.

Ambrosia trifida
Giant Ragweed

Also known as Bloodweed - its sap is blood-red.

Habitat - Low woods, along streams, pond margins, waste ground, roadsides, railroads.

Origin - Native to U.S.

Can reach 15 feet tall, is very prolific and forms huge colonies when left undisturbed.