How to Control Japanese Knotweed

By woodlandstv

Slow connection? Watch in lower quality

With an academic background in biology, environmental forestry and eco-physiology, Dr Paul Beckett shares his expertise in Japanese Knotweed - its life-cycle, different methods of managing it, plus the legalities of it being a `controlled waste`. In collaboration with Professor Anthony Moore of the University of Sussex and Julia Shearman, a PhD student funded by the Biotechnology and Biological Science Research Council, he is looking at new ways to inhibit the rapid growth of this invasive plant.
An Adliberate film http://www.adliberate.co.uk for WoodlandsTV http://www.woodlands.co.uk/tv

Comments are closed for this post.


I've been hearing this for years: No succes. Doesn't work.


July 21, 2019

5 years on any negative effects from eating it?


July 24, 2019

@BluuurghAg9 have you had success with anything else?
My local mosque has knotweed in the carpark so I'm looking for a solution.


August 4, 2019

I'm pretty sure she's allowed to do whatever the fuck she wants.


August 15, 2019

Introducing a insect that feeds on knotweed and saying it only feeds on knotweed is dangerous. They released sterile mosquitoes into the wild thinking it would kill of the mosquito but in the wild it mutated and started laying more lava than normal mosquitos.
You cannot introduce something else and expect it to only target what you want, it may have no natural predators for it in the UK so it may develop a taste for other species of plant and become a new pest it may take 2 years or 10 but foreign species should not be introduced.

NO Expectations

October 11, 2019

Locally in Ystalyfera South Wales, there's areas being treated, but Glyphosate needs to be both sprayed and injected, but doesn't work on it's own, the guys have also been using 2,4-D and Triclopyr, mixed results, a slow recurring process, over several years, but it does seem to be working.


October 12, 2019

Roundup injected into the hollow stem is effective in controlling Knotweed.

Bills Sawshop

October 16, 2019

Thank you for the thoughtful video. In North America, we are way behind you in awareness of the problem with invasive knotweeds. Regrettably, we may be ahead of you in creating more virulent hybrid species of knotweed from the four widely recognized species over here. We have had the best luck with successive applications of herbicide in the fall. This first shot is very successful at killing most of the underground rhizome. Thereafter, we use targeted applications of a different herbicide and mechanical removal to deal with the stragglers. It seems after the first shock of herbicide, the colony goes into semi-dormancy. I wonder whether that can be attributed to the plant's origins in Japan where it had to survive periods of heightened volcanic activity.

Green Shoots

April 17, 2020

Controlled fire

Wakinyan Wortcunner

April 22, 2020

Its crazy. Why are we trying to find a way to destroy it if it has extremely strong medicinal uses and can even be used as a tasty food source. Humans are so weird.

Wakinyan Wortcunner

April 22, 2020