Ragweeds are annual and perennial herbs and shrubs. Species may grow just a few centimeters tall or exceed four meters in height. The stems are erect, decumbent or prostrate, and many grow from rhizomes. The leaves may be … See more

Ragweed pollen is a common allergen. A single plant may produce about a billion grains of pollen per season, and the pollen is transported on the wind. It causes about half of all cases of … See more

There are about 50 species in genus Ambrosia. Species include:
• Ambrosia acanthicarpa Hook. – flatspine bur ragweed, annual bursage, sand bursage See more

Where herbicides cannot be used, mowing may be repeated about every three weeks, as it grows back rapidly. In the past, ragweed was usually cut down, left to dry, and then burned. This method is used less often now, because of the pollution caused by smoke. … See more

• Media related to Ambrosia at Wikimedia Commons
• GRIN Species Records of Ambrosia Archived 2008-10-05 at the Wayback Machine. Germplasm Resources Information Network (GRIN). See more