Giant Knotweed in Howard Co., Maryland (6/18/2010). Note cordate leaf bases.

View Record Details Photo by Bill Harms MBP List

Giant Knotweed in Calvert Co., Maryland (4/18/2020).

View Record Details Photo by Ben Springer MBP List

Giant Knotweed in Calvert Co., Maryland (4/18/2020).

View Record Details Photo by Ben Springer MBP List

Giant Knotweed in Howard Co., Maryland (4/19/2017).

View Record Details Photo by Bill Harms MBP List

Giant Knotweed in Howard Co., Maryland (8/25/2015).

View Record Details Photo by Wesley Knapp MBP List

Giant Knotweed in Howard Co., Maryland (4/10/2016).

View Record Details Photo by Timothy Reichard MBP List

Giant Knotweed in Baltimore Co., Maryland (4/27/2020). (c) courant, some rights reserved (CC BY-NC).

View Record Details Photo by courant via iNaturalist MBP List

Giant Knotweed in Baltimore Co., Maryland (5/14/2016). Verified by Wes Knapp.

View Record Details Photo by Bill Hubick MBP List

Young growth of Giant Knotweed in Howard Co., Maryland (4/10/2016).

View Record Details Photo by Timothy Reichard MBP List

Giant Knotweed in Baltimore Co., Maryland (5/7/2017).

View Record Details Photo by Bill Harms MBP List

Giant Knotweed in Howard Co., Maryland (6/2/2017).

View Record Details Photo by Bill Harms MBP List

Map Snapshot

50 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

Description

Compare abundant Japanese Knotweed. Giant Knotweed has cordate (heart-shaped) leaf bases.

Seasonality Summary

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Resources

View at iNaturalist 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 Search MNPS Facebook posts

Citations

No citations linked for this taxon yet.

MBP marks as "Invasive" any taxon listed in the Maryland Invasive Species Council (MISC) list of Invasive Species of Concern in Maryland. You can read their criteria and review the lists here: https://mdinvasives.org/species-of-concern/. Use of media featured on Maryland Biodiversity Project is only permitted with express permission of the photographer.

Giant Knotweed in Howard Co., Maryland (6/18/2010). Note cordate leaf bases. View Record Details Media by Bill Harms.

Giant Knotweed in Calvert Co., Maryland (4/18/2020). View Record Details Media by Ben Springer.

Giant Knotweed in Howard Co., Maryland (4/19/2017). View Record Details Media by Bill Harms.

Giant Knotweed in Howard Co., Maryland (8/25/2015). View Record Details Media by Wesley Knapp.

Giant Knotweed in Howard Co., Maryland (4/10/2016). View Record Details Media by Timothy Reichard.

Giant Knotweed in Baltimore Co., Maryland (4/27/2020). (c) courant, some rights reserved (CC BY-NC). View Record Details Media by courant via iNaturalist.

Giant Knotweed in Baltimore Co., Maryland (5/14/2016). Verified by Wes Knapp. View Record Details Media by Bill Hubick.

Young growth of Giant Knotweed in Howard Co., Maryland (4/10/2016). View Record Details Media by Timothy Reichard.

Giant Knotweed in Baltimore Co., Maryland (5/7/2017). View Record Details Media by Bill Harms.

Giant Knotweed in Howard Co., Maryland (6/2/2017). View Record Details Media by Bill Harms.