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Reynoutria sachalinensis

Giant Knotweed at Paddys River, ACT

Reynoutria sachalinensis at Paddys River, ACT - 22 Nov 2013
Reynoutria sachalinensis at Paddys River, ACT - 22 Nov 2013
Reynoutria sachalinensis at Paddys River, ACT - 22 Nov 2013
Reynoutria sachalinensis at Paddys River, ACT - 22 Nov 2013
Reynoutria sachalinensis at Paddys River, ACT - 22 Nov 2013
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Identification history

Reynoutria sachalinensis 28 Jan 2015 MichaelMulvaney
Unidentified 12 Jan 2015 galah681

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User's notes

Near large granite outcrop between Rock valley homestead and the Tidbinbilla river

5 comments

galah681 wrote:
   13 Jan 2015
This could be Fallopia japonica - Japanese knotweed. It is affected by frost but recovers each year. It only seems to occur in one small area and has not spread. It could have been planted by the original Rock Valley owners for horse feed.
   26 Jan 2015
Jenny are the leaves on this bigger than your hand?
galah681 wrote:
   26 Jan 2015
Yes. Some are very large.
   28 Jan 2015
Jenny based on the large leaf size and flower arrangement I think this is Giant Knotweed Fallopia sachalinensis
galah681 wrote:
   31 Jan 2015
Thank you for identifying this weed. Now we have to see if anything can be done to remove it as there seems to be a lot more this year - it must like the rain and cooler conditions. It is interesting that Plantnet actually mentions its occurrence at Tidbinbilla.

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Location information

Sighting information

Additional information

  • True In flower

Species information

  • Reynoutria sachalinensis Scientific name
  • Giant Knotweed Common name
  • Not Sensitive
  • Exotic
  • Medium weed or pest
  • Up to 738.1m Recorded at altitude
  • Machine learning
  • In flower
  • Synonyms

    Fallopia sachalinensis

Record quality

  • Images or audio
  • More than one media file
  • Verified by an expert moderator
  • Nearby sighting(s) of same species
  • GPS evidence of location
  • Description
  • Additional attributes
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