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The following is just rough background knowledge, not substantiated: it was brought into the UK around the Victorian era as a decorative plant in gardens. It's spread quickly to most parts of the country, grows on railway embankments, roadsides, motorway verges. In the UK climate at least it's very vigorous, and regarded in the UK as a pest; apparently it's one of only 2 plants whose propagation is forbidden by law. -- Tarquin
I've removed:
because such precision makes me wonder if the writer means the 19th century or the decade of the 1800s. -- Tarquin 09:46 Jan 6, 2003 (UTC)
That quote clearly looks to be about a century period, not a decade. 69.87.203.190 20:29, 21 December 2006 (UTC)
The species is a frequent invader in Europe and the U.K.
Is the British island forms part to the American continent? Plate tectonics? ;) Pixeltoo 15:14, 8 August 2005 (UTC)
What is the best way to raise shoots indoors for consumption year-round? 69.87.200.9 20:40, 19 November 2006 (UTC)
What growing conditions (temp/light etc) make it sprout? Make it die back? Keep it dormant? 69.87.194.175 21:20, 21 November 2006 (UTC) japanese knotweed is the best plant a baby panda could play with so if you own a zoo give that new panda a japanese knotweed
Probably best not to try. Really expensive if it spreads to your garden can be tens of thousands of pounds to remove, or off your house price, and improper disposal is illegal in the UK. —Preceding unsigned comment added by 82.44.68.212 ( talk) 17:31, 28 September 2010 (UTC)
Back in 2003 when I edited this page I added a link to a website that I had created ( http://www.knottybits.com/knotweed) . This appears to be in conflict with Wikipedia's current editing policy so I just want to put it out there in case someone wants to review the external links and decide whether my website should be deleted. Urtica 05:24, 21 August 2007 (UTC)
This article talk page was automatically added with {{ WikiProject Food and drink}} banner as it falls under Category:Food or one of its subcategories. If you find this addition an error, Kindly undo the changes and update the inappropriate categories if needed. The bot was instructed to tagg these articles upon consenus from WikiProject Food and drink. You can find the related request for tagging here . Maximum and careful attention was done to avoid any wrongly tagging any categories , but mistakes may happen... If you have concerns , please inform on the project talk page -- TinucherianBot ( talk) 22:17, 3 July 2008 (UTC)
I have restored the sentence to say "weed" rather than "green waste". I have no reason to doubt that Japanese knotweed is a large source of green waste, but that is a different topic. This paragraph is about the undesirable aspects of the plant. Spiel496 ( talk) 16:27, 7 July 2008 (UTC)
References 8,9 and 11 appear to be links to sellers of this product. Ykral ( talk) 11:08, 29 January 2009 (UTC)
Three more commercial links removed. Tompow ( talk) 12:15, 13 August 2009 (UTC)
The figure of £1.6 billion annually has been added, citing the Daily Mail. This size of this figure is not credible. This is more than the annual budget Environment Agency . -- FDent ( talk) 16:45, 14 July 2013 (UTC)
Is there any confusion in the name? Fallopia convolvulus (L.) A.Love (Polygonum convolvulus L.) seems to be confused here. Is F.japonica a different species? Osborne 20:58, 21 March 2014 (UTC)
Reynoutria japonica (Polygonum cuspidatum) is indeed a different species from Fallopia convolvulus. In Webbs Irish Flora (1996) the key notes: Annual, with twining stem....Fallopia. Perennial, with stout, erect stems...Reynoutria..Osborne 18:57, 22 March 2014 (UTC)
Webb, D.A., Parnell, J. and Doogue, D. 1996. An Irish Flora. Dundalgan Press, Dundalk. ISBN 0-85221-131-7
Is the Japanese "itadori" spelling correct? I believe it should be 虎杖 - appears someone changed it to "dead infant" which I can't find support for. — Preceding unsigned comment added by 2600:1000:B10B:245C:9DF:D65D:52EC:7BED ( talk) 16:41, 17 August 2015 (UTC)
Hello all,
The following fact is missing a citation / reference: "The leaves are broad oval with a truncated base, 7–14 cm long and 5–12 cm broad"
I suggested this reference: https://www.japaneseknotweed.co.uk/japanese-knotweed-identification
There was a COI there so one of the editors kindly gave me a few Wiki etiquette pointers. Anyhoo, my question is this; Japanese Knotweed Lts are genuinely experts in their field, so does this warrant being a reference or does the fact that the website is commercial mean that it's not appropriate?
Next question, where would I find a more suitable reference if this one is deemed inappropriate?
Thanks, team! PaddyPassionDigital ( talk) 15:54, 2 June 2014 (UTC)
(sorry if I mess up anything I haven't edited wiki in a while) The fifth citation is no longer valid, as it seems the domain has gone up for sale. and it thus needs replacing. — Preceding unsigned comment added by 96.237.189.150 ( talk) 17:37, 7 June 2015 (UTC)
Thanks, Naturenet. I've updated the reference to the one you suggested :) PJone ( talk) 10:39, 6 June 2014 (UTC)
This species is widely known as Polygonum cuspidatum (and that name redirects to this page), but it appears nowhere in the article and there is no discussion of the taxonomy or alternative names in the article. 160.111.254.17 ( talk) 20:12, 5 July 2016 (UTC)
@
Plantsurfer: it's an interesting question as to whether Reynoutria japonica is the currently accepted name of the species
. The facts seem clear (and are summarized in the Discussion section of
this 2013 article). Recent molecular phylogenetic studies have established that there's a clade, the "RMF" clade, made up of Reynoutria, Muehlenbeckia and Fallopia subclades. There are then two choices:
It's not clear at present, I think, which of these approaches will be most persuasive to taxonomists in the long run.
The Taxonomy sections of relevant articles need some work. Peter coxhead ( talk) 09:45, 23 September 2016 (UTC)
TPL does have it listed as Reynoutria japonica:
http://www.theplantlist.org/tpl1.1/record/kew-2428745
Invertzoo ( talk) 16:43, 6 September 2017 (UTC)
There are reports that the hollow stem is sometimes "water-filled", at least the lower above-ground part. If this is true, it seems worth mentioning in the article.- 71.174.180.38 ( talk) 22:31, 13 September 2016 (UTC)
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BBC Spicemix ( talk) 16:31, 25 April 2018 (UTC)
Rarest? Student Naylor ( talk) 07:33, 29 May 2022 (UTC)
Q Student Naylor ( talk) 07:33, 29 May 2022 (UTC)
cardboard fulfills a similar role as concrete slabs for mechanical removal — used over time it also has the advantage of being biodegradable. Ycleptkyara ( talk) 00:40, 15 January 2023 (UTC)
39 reference link sends to main page of website due to broken url 86.1.166.165 ( talk) 23:16, 18 May 2023 (UTC)
The story of its introduction by Thomas Hogg should be added to this article. It's an important detail, a cautionary tale for our globalized world. Sorry, I don't have the time to do it. 2A01:CB14:2D:9600:2D7E:9E3D:18DF:E09D ( talk) 08:38, 20 June 2023 (UTC)
![]() | This article is rated B-class on Wikipedia's
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The following is just rough background knowledge, not substantiated: it was brought into the UK around the Victorian era as a decorative plant in gardens. It's spread quickly to most parts of the country, grows on railway embankments, roadsides, motorway verges. In the UK climate at least it's very vigorous, and regarded in the UK as a pest; apparently it's one of only 2 plants whose propagation is forbidden by law. -- Tarquin
I've removed:
because such precision makes me wonder if the writer means the 19th century or the decade of the 1800s. -- Tarquin 09:46 Jan 6, 2003 (UTC)
That quote clearly looks to be about a century period, not a decade. 69.87.203.190 20:29, 21 December 2006 (UTC)
The species is a frequent invader in Europe and the U.K.
Is the British island forms part to the American continent? Plate tectonics? ;) Pixeltoo 15:14, 8 August 2005 (UTC)
What is the best way to raise shoots indoors for consumption year-round? 69.87.200.9 20:40, 19 November 2006 (UTC)
What growing conditions (temp/light etc) make it sprout? Make it die back? Keep it dormant? 69.87.194.175 21:20, 21 November 2006 (UTC) japanese knotweed is the best plant a baby panda could play with so if you own a zoo give that new panda a japanese knotweed
Probably best not to try. Really expensive if it spreads to your garden can be tens of thousands of pounds to remove, or off your house price, and improper disposal is illegal in the UK. —Preceding unsigned comment added by 82.44.68.212 ( talk) 17:31, 28 September 2010 (UTC)
Back in 2003 when I edited this page I added a link to a website that I had created ( http://www.knottybits.com/knotweed) . This appears to be in conflict with Wikipedia's current editing policy so I just want to put it out there in case someone wants to review the external links and decide whether my website should be deleted. Urtica 05:24, 21 August 2007 (UTC)
This article talk page was automatically added with {{ WikiProject Food and drink}} banner as it falls under Category:Food or one of its subcategories. If you find this addition an error, Kindly undo the changes and update the inappropriate categories if needed. The bot was instructed to tagg these articles upon consenus from WikiProject Food and drink. You can find the related request for tagging here . Maximum and careful attention was done to avoid any wrongly tagging any categories , but mistakes may happen... If you have concerns , please inform on the project talk page -- TinucherianBot ( talk) 22:17, 3 July 2008 (UTC)
I have restored the sentence to say "weed" rather than "green waste". I have no reason to doubt that Japanese knotweed is a large source of green waste, but that is a different topic. This paragraph is about the undesirable aspects of the plant. Spiel496 ( talk) 16:27, 7 July 2008 (UTC)
References 8,9 and 11 appear to be links to sellers of this product. Ykral ( talk) 11:08, 29 January 2009 (UTC)
Three more commercial links removed. Tompow ( talk) 12:15, 13 August 2009 (UTC)
The figure of £1.6 billion annually has been added, citing the Daily Mail. This size of this figure is not credible. This is more than the annual budget Environment Agency . -- FDent ( talk) 16:45, 14 July 2013 (UTC)
Is there any confusion in the name? Fallopia convolvulus (L.) A.Love (Polygonum convolvulus L.) seems to be confused here. Is F.japonica a different species? Osborne 20:58, 21 March 2014 (UTC)
Reynoutria japonica (Polygonum cuspidatum) is indeed a different species from Fallopia convolvulus. In Webbs Irish Flora (1996) the key notes: Annual, with twining stem....Fallopia. Perennial, with stout, erect stems...Reynoutria..Osborne 18:57, 22 March 2014 (UTC)
Webb, D.A., Parnell, J. and Doogue, D. 1996. An Irish Flora. Dundalgan Press, Dundalk. ISBN 0-85221-131-7
Is the Japanese "itadori" spelling correct? I believe it should be 虎杖 - appears someone changed it to "dead infant" which I can't find support for. — Preceding unsigned comment added by 2600:1000:B10B:245C:9DF:D65D:52EC:7BED ( talk) 16:41, 17 August 2015 (UTC)
Hello all,
The following fact is missing a citation / reference: "The leaves are broad oval with a truncated base, 7–14 cm long and 5–12 cm broad"
I suggested this reference: https://www.japaneseknotweed.co.uk/japanese-knotweed-identification
There was a COI there so one of the editors kindly gave me a few Wiki etiquette pointers. Anyhoo, my question is this; Japanese Knotweed Lts are genuinely experts in their field, so does this warrant being a reference or does the fact that the website is commercial mean that it's not appropriate?
Next question, where would I find a more suitable reference if this one is deemed inappropriate?
Thanks, team! PaddyPassionDigital ( talk) 15:54, 2 June 2014 (UTC)
(sorry if I mess up anything I haven't edited wiki in a while) The fifth citation is no longer valid, as it seems the domain has gone up for sale. and it thus needs replacing. — Preceding unsigned comment added by 96.237.189.150 ( talk) 17:37, 7 June 2015 (UTC)
Thanks, Naturenet. I've updated the reference to the one you suggested :) PJone ( talk) 10:39, 6 June 2014 (UTC)
This species is widely known as Polygonum cuspidatum (and that name redirects to this page), but it appears nowhere in the article and there is no discussion of the taxonomy or alternative names in the article. 160.111.254.17 ( talk) 20:12, 5 July 2016 (UTC)
@
Plantsurfer: it's an interesting question as to whether Reynoutria japonica is the currently accepted name of the species
. The facts seem clear (and are summarized in the Discussion section of
this 2013 article). Recent molecular phylogenetic studies have established that there's a clade, the "RMF" clade, made up of Reynoutria, Muehlenbeckia and Fallopia subclades. There are then two choices:
It's not clear at present, I think, which of these approaches will be most persuasive to taxonomists in the long run.
The Taxonomy sections of relevant articles need some work. Peter coxhead ( talk) 09:45, 23 September 2016 (UTC)
TPL does have it listed as Reynoutria japonica:
http://www.theplantlist.org/tpl1.1/record/kew-2428745
Invertzoo ( talk) 16:43, 6 September 2017 (UTC)
There are reports that the hollow stem is sometimes "water-filled", at least the lower above-ground part. If this is true, it seems worth mentioning in the article.- 71.174.180.38 ( talk) 22:31, 13 September 2016 (UTC)
Hello fellow Wikipedians,
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Cheers.— InternetArchiveBot ( Report bug) 12:45, 29 December 2016 (UTC)
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BBC Spicemix ( talk) 16:31, 25 April 2018 (UTC)
Rarest? Student Naylor ( talk) 07:33, 29 May 2022 (UTC)
Q Student Naylor ( talk) 07:33, 29 May 2022 (UTC)
cardboard fulfills a similar role as concrete slabs for mechanical removal — used over time it also has the advantage of being biodegradable. Ycleptkyara ( talk) 00:40, 15 January 2023 (UTC)
39 reference link sends to main page of website due to broken url 86.1.166.165 ( talk) 23:16, 18 May 2023 (UTC)
The story of its introduction by Thomas Hogg should be added to this article. It's an important detail, a cautionary tale for our globalized world. Sorry, I don't have the time to do it. 2A01:CB14:2D:9600:2D7E:9E3D:18DF:E09D ( talk) 08:38, 20 June 2023 (UTC)