Map Snapshot
42 Records
Description
Compare abundant Japanese Knotweed. Giant Knotweed has cordate (heart-shaped) leaf bases.
Seasonality Snapshot
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.
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Media by
Bill Harms.
Giant Knotweed in Calvert Co., Maryland (4/18/2020).
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Media by
Ben Springer.
Giant Knotweed in Calvert Co., Maryland (4/18/2020).
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Media by
Ben Springer.
Giant Knotweed in Howard Co., Maryland (4/19/2017).
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Media by
Bill Harms.
Giant Knotweed in Howard Co., Maryland (8/25/2015).
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Media by
Wesley Knapp.
Giant Knotweed in Howard Co., Maryland (4/10/2016).
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Media by
Timothy Reichard.
Giant Knotweed in Baltimore Co., Maryland (4/27/2020). (c) courant, some rights reserved (CC BY-NC).
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Media by
courant via iNaturalist.
Giant Knotweed in Baltimore Co., Maryland (5/14/2016). Verified by Wes Knapp.
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Media by
Bill Hubick.
Young growth of Giant Knotweed in Howard Co., Maryland (4/10/2016).
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Media by
Timothy Reichard.
Giant Knotweed in Baltimore Co., Maryland (5/7/2017).
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Media by
Bill Harms.
Giant Knotweed in Howard Co., Maryland (6/2/2017).
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Media by
Bill Harms.