Giant Knotweed Reynoutria sachalinense (F. Schmidt ex Maximowicz) NakaiNon-native  Synonyms: Fallopia sachalinensis, Polygonum sachalinensis.

Description:

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

There are 19 records in the project database.

View species at Maryland Plant Atlas

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Giant Knotweed in Howard Co., Maryland (6/18/2010). Note cordate leaf bases. Photo by Bill Harms. (MBP list)

Giant Knotweed in Howard Co., Maryland (4/19/2017). Photo by Bill Harms. (MBP list)

Giant Knotweed in Howard Co., Maryland (8/25/2015). Photo by Wesley Knapp. (MBP list)

Giant Knotweed in Howard Co., Maryland (4/10/2016). Photo by Timothy Reichard. (MBP list)

Giant Knotweed in Baltimore Co., Maryland (5/14/2016). Verified by Wes Knapp. Photo by Bill Hubick. (MBP list)

Young growth of Giant Knotweed in Howard Co., Maryland (4/10/2016). Photo by Timothy Reichard. (MBP list)

Giant Knotweed in Baltimore Co., Maryland (5/7/2017). Photo by Bill Harms. (MBP list)

Giant Knotweed in Howard Co., Maryland (6/2/2017). Photo by Bill Harms. (MBP list)


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