Great Ragweed in Dorchester Co., Maryland (9/13/2016).

View Record Details Photo by Wayne Longbottom MBP List

The leaves of Great Ragweed in Dorchester Co., Maryland (6/25/2013).

View Record Details Photo by Jim Brighton MBP List

Great Ragweed in Howard Co., Maryland (9/7/2017).

View Record Details Photo by Bill Hubick MBP List

Great Ragweed in Worcester Co., Maryland (8/19/2012).

Photo by Bill Hubick MBP List

The blooms of a Great Ragweed in Talbot Co., Maryland (9/1/2013).

View Record Details Photo by Jim Brighton MBP List

Great Ragweed blooming in Calvert Co., Maryland (8/29/2019).

View Record Details Photo by Tyler Bell MBP List

Great Ragweed in Caroline Co., Maryland (9/13/2016).

View Record Details Photo by Wayne Longbottom MBP List

Great Ragweed growing in Harford Co., Maryland (8/19/2017).

View Record Details Photo by Josh Emm MBP List

Great Ragweed (flowers) in Howard Co., Maryland (9/3/2013).

View Record Details Photo by Joanne Solem MBP List

Great Ragweed (close-up) in Anne Arundel Co., Maryland (8/28/2012).

View Record Details Photo by Bill Harms MBP List

Great Ragweed in Howard Co., Maryland (9/3/2013).

View Record Details Photo by Joanne Solem MBP List

Great Ragweed in Howard Co., Maryland (8/24/2020). (c) johnbotany, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 209734 - Psn: 65)

Great Ragweed in Howard Co., Maryland (8/24/2020). (c) johnbotany, some rights reserved (CC BY-NC).

View Record Details Photo by John Hall MBP List

Great Ragweed in Allegany Co., Maryland (7/21/2014).

Photo by Kimberly Booth MBP List

Great Ragweed in Anne Arundel Co., Maryland (8/30/2017).

View Record Details Photo by Tyler Bell MBP List

Great Ragweed in Allegany Co., Maryland (7/21/2014).

View Record Details Photo by Kimberly Booth MBP List

Great Ragweed hosting a <em>Calycomyza platyptera</em> leaf mine in Worcester Co., Maryland (8/5/2018). (Photo ID: 118712 - Psn: 90)

Great Ragweed hosting a Calycomyza platyptera leaf mine in Worcester Co., Maryland (8/5/2018).

View Record Details Photo by Josh Emm MBP List

Great Ragweed in Baltimore Co., Maryland (8/27/2016).

View Record Details Photo by Kirsten Johnson MBP List

Great Ragweed in Baltimore City, Maryland (6/23/2018). (c) Sam Little, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 243798 - Psn: 200)

Great Ragweed in Baltimore City, Maryland (6/23/2018). (c) Sam Little, some rights reserved (CC BY-NC).

View Record Details Photo by Sam Little via iNaturalist MBP List

Great Ragweed in Montgomery Co., Maryland (7/3/2019). (c) pikachueevee55055, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 262085 - Psn: 200)

Great Ragweed in Montgomery Co., Maryland (7/3/2019). (c) pikachueevee55055, some rights reserved (CC BY-NC).

View Record Details Photo by pikachueevee55055 via iNaturalist MBP List

Great Ragweed in Baltimore City, Maryland (7/6/2019). (c) Brett M, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 262138 - Psn: 200)

Great Ragweed in Baltimore City, Maryland (7/6/2019). (c) Brett M, some rights reserved (CC BY-NC).

View Record Details Photo by Brett M via iNaturalist MBP List

Great Ragweed in Anne Arundel Co., Maryland (8/28/2012).

View Record Details Photo by Bill Harms MBP List

Map Snapshot

340 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

Status

Great Ragweed is common across the state. It can be found in a variety of habitats including, bottomlands, rich wood edges, roadsides, and cultivated areas.

Description

Great Ragweed can grow to over ten feet tall. The three (rarely four or five) cleft leaves are diagnostic among Maryland herbaceous plants. Flowers are on long spikes or racemes.

Relationships

Host to Euaresta festiva larvae.

Host to Black-smudged Chionodes Moth. Leaves are mined by the micro-moth Astrotischeria ambrosiaeella.

Seasonality Snapshot

Resources

View at iNaturalist View at NatureServe Explorer Search Google Images Search MBP Facebook posts

View at Maryland Plant Atlas Search Flora of North America Search Mid-Atlantic Herbaria Consortium Search Norton-Brown Herbarium

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

Great Ragweed in Dorchester Co., Maryland (9/13/2016). View Record Details Media by Wayne Longbottom.

The leaves of Great Ragweed in Dorchester Co., Maryland (6/25/2013). View Record Details Media by Jim Brighton.

Great Ragweed in Howard Co., Maryland (9/7/2017). View Record Details Media by Bill Hubick.

Great Ragweed in Worcester Co., Maryland (8/19/2012). Media by Bill Hubick.

The blooms of a Great Ragweed in Talbot Co., Maryland (9/1/2013). View Record Details Media by Jim Brighton.

Great Ragweed blooming in Calvert Co., Maryland (8/29/2019). View Record Details Media by Tyler Bell.

Great Ragweed in Caroline Co., Maryland (9/13/2016). View Record Details Media by Wayne Longbottom.

Great Ragweed growing in Harford Co., Maryland (8/19/2017). View Record Details Media by Josh Emm.

Great Ragweed (flowers) in Howard Co., Maryland (9/3/2013). View Record Details Media by Joanne Solem.

Great Ragweed (close-up) in Anne Arundel Co., Maryland (8/28/2012). View Record Details Media by Bill Harms.

Great Ragweed in Howard Co., Maryland (9/3/2013). View Record Details Media by Joanne Solem.

Great Ragweed in Howard Co., Maryland (8/24/2020). (c) johnbotany, some rights reserved (CC BY-NC). View Record Details Media by John Hall.

Great Ragweed in Allegany Co., Maryland (7/21/2014). Media by Kimberly Booth.

Great Ragweed in Anne Arundel Co., Maryland (8/30/2017). View Record Details Media by Tyler Bell.

Great Ragweed in Allegany Co., Maryland (7/21/2014). View Record Details Media by Kimberly Booth.

Great Ragweed hosting a Calycomyza platyptera leaf mine in Worcester Co., Maryland (8/5/2018). View Record Details Media by Josh Emm.

Great Ragweed in Baltimore Co., Maryland (8/27/2016). View Record Details Media by Kirsten Johnson.

Great Ragweed in Baltimore City, Maryland (6/23/2018). (c) Sam Little, some rights reserved (CC BY-NC). View Record Details Media by Sam Little via iNaturalist.

Great Ragweed in Montgomery Co., Maryland (7/3/2019). (c) pikachueevee55055, some rights reserved (CC BY-NC). View Record Details Media by pikachueevee55055 via iNaturalist.

Great Ragweed in Baltimore City, Maryland (7/6/2019). (c) Brett M, some rights reserved (CC BY-NC). View Record Details Media by Brett M via iNaturalist.

Great Ragweed in Anne Arundel Co., Maryland (8/28/2012). View Record Details Media by Bill Harms.