Annual Ragweed blooming in Montgomery Co., Maryland (8/2/2014).

Annual Ragweed, also known as Common Ragweed and Hay Fever Weed, in Prince George's Co., Maryland (8/5/2012).

Photo by Bill Hubick MBP List

Annual Ragweed in Kent Co., Maryland (7/5/2016).

Annual Ragweed growing in St. Mary's Co., Maryland (5/10/2016).

Annual Ragweed in Anne Arundel Co., Maryland (9/24/2016).

Annual Ragweed growing in Garrett Co., Maryland (8/20/2006).

Annual Ragweed in Baltimore City, Maryland (8/27/2025). (c) Matthew Beziat, some rights reserved (CC BY-NC).

Annual Ragweed in Kent Co., Maryland (9/3/2013).

674 Records

GA AL WA FR CL MO HO BA BC HA CE PG AA CV CH SM KE QA CN TA DO WI SO WO

This common species' wind-dispersed pollen is notorious for producing late summer and fall allergies.

Host plant for various beetle species including Ophraella commnuna and Cylindrocopturus quercus.

Host plant for various moth species including Astrotischeria ambrosiaeella (leafminer), Ragweed Borer Moth, Epiblema minutana, and Bidens Borer Moth.

Host plant for various fly species including Calycomyza ambrosiae (leafminer).

View at iNaturalist Search Google Images Search MBP Facebook posts

No citations linked for this taxon yet.

Use of media featured on Maryland Biodiversity Project is only permitted with express permission of the photographer.

Annual Ragweed blooming in Montgomery Co., Maryland (8/2/2014). View Record Details Media by Jim Brighton.

Annual Ragweed, also known as Common Ragweed and Hay Fever Weed, in Prince George's Co., Maryland (8/5/2012). Media by Bill Hubick.

Annual Ragweed in Kent Co., Maryland (7/5/2016). View Record Details Media by Nancy Martin.

Annual Ragweed growing in St. Mary's Co., Maryland (5/10/2016). View Record Details Media by Nancy Martin.

Annual Ragweed in Anne Arundel Co., Maryland (9/24/2016). View Record Details Media by Bill Harms.

Annual Ragweed growing in Garrett Co., Maryland (8/20/2006). View Record Details Media by Boyer and McDowell.

Annual Ragweed in Baltimore City, Maryland (8/27/2025). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

Annual Ragweed in Kent Co., Maryland (9/3/2013). View Record Details Media by Jim Brighton.