Best option is to cover the area with a weed barrier cloth. Chemicals do not work, I have a 3 acre prop. in NE with wetland and state I live its illegal. Mark the area in spring, apply the barrier. Followed by a thin layer of soil, another barrier and more soil. Keep in mind that it could take several years for the roots to completely die and to make sure the area you are targeting does NOT have any established colonies of weeds nearby. I did a cleaning summer prior and burned weeds....

I wasn't aware of that, either. Interesting. All I know is these darned things are growing all along the fence in my backyard, and they grow back quick once you break them off in winter. They don't seem to be easy to get rid of.

Care to say what chemical you're using? Does it respond to 2,4-d by itself?

What herbicide do you use and most importantly, where did you get the herbicide injector? I want to try this method. Nothing else I have done works. It seems to love being cut, having salt put on it, cooking oil on it, all the herbicides I have tried so far, and digging it up is a nightmare. Nothing seems to work.

How not to do it! Protective clothing overalls, gloves, eye protection and breathing filter a legal requirement in the UK

Where can injector guns be purchased?

You on the right idea, but you wont be killing the knotweed, merely controlling it. I treat this stuff for a living and there is a bit more method involved for successful eradication.

Always wear a long sleeved shirt when spraying!!!

Shame, there's a nice patch of horsetail and cattails growing right there near the waters edge, both great foraging / edible plants. Knotweed is also edible in its early stages...check it out.

Great, but what chemical did you use?

where can I buy one of them guns and how much are they

Cultivating this stuff is an offence in the UK. Nasty stuff worse than ivy.

Think about PA1 - PA6!!!

For the UK, do not do this. You must be licenced and qaulified for the control of knotweed with this type of treatment. The PPE used is NOT good enough,

LMFAO where is his spray suit???? full face visor, wellies??? hahhaaa

nice try but so dangerous, please remove this , read up on more info on the subject and take into account the safety issues on using chemicals 'i'e clothing, oh and what herbicide do you recommend

Has anyone tried Salt to kill this weed

Knotweed - Aminopyralid (know your label and residual effects). Hemlock- 2,4-D or 2,4-d and Tryclopyr. This is an awful video, but I want you to know how to kill these invasives.

You don't tell us what chemical you used.

You spent more time on the dam editing, both video & audio, than actually helping with the eradication of the invasive species... what was that about purple spots & killing you in 30 minutes? Obviously a ploy to make us watch over & over til we figure out what the