Jeyes fluid. £7 a litre in Wilkinsons. Burns everything it touches if you don't water it down too much. I fill an old spray can and use it to keep my neighbour's bamboo from spreading into my garden.

This thing can come though brickwork and cement with ease. If you trouble it and it spreads to neighbouring properties, you will be responsible for not only the treatment for your neighbours garden , but also the damage it may cause to the structure of their home. Do not touch it before you read up about this thing if you see it in your garden.

How did this turn out?

What brand weed killer do you use?

i use salt as a weed killer, i buy bags designed for winter ice prevention on paths. pour it over the weeds during a dry period, i haven't seen any weeds survive it. worth a try?

Did you eradicate?

Japanese hops has killed a field of knotweed in my area much to my surprise! I learned that it will evrr error kill trees. Bees love to pollinate it and the honey is dark like buckwheat honey.

Round up is very weak glysulphate that is for annual weeds you need a brush wood killer like sbk. you also need a license to use professional grade herbicide

Highway salt, or calcium chloride used liberally after diggining it up will kill the stubborn little root shoots. Or dump a mound over the exposed plant and you'll have the same effect.

What is that. I’ve got a hole bush

Hi Matt, any update? Did you manage to kill it off or at least keep it in check?

I'd like to get rid of my knotweed but I'm not a fan of Roundup glyphosate killer in my garden. There must be an alternative. So far, I've been digging out the roots carefully. I dumped the remains with the waste dump instead of the recycling were it could sprout again in compost.

Dump the music please, it gets to be a nuisance when listening?

Roundup.. the Devils handmaiden!!

Not really going to do anything spraying it like that. Good luck

it came over here in the 1850's has an ornament plant that's when all hell broke lose .

I want to get japanese knotweed seeds. How can I do it. Please help.

battery acid kills it instant forget round up

Nitro Moors paint stripper will also Kill it, But might also kill everything else to.

Spraying the leaves and stems will surely provide you with enough work for the future... To really kill this plant you need to cut every single stem and pour something in it, but definitely not Roundup, since this stuff is extremely harmful to the environment and people. Compounds which are to be considered are formic or phosphoric acid.

a few gallons of diesel should do the trick

Can guarantee the builders put that there. Probably horrible clients.

Lemme save you 3 minutes. Knotweed is knot a problem. All you gotta do is get some garden variety scissors, cut it into manageable portions and roll it into an expansion joint. I won't lie, the only unmanageable thing about knotweed is how high it gets you when you smoke it down. It's the highest I've ever been, my mind snapped like a carrot. You know it's pure when you see those orange flecks. Just seconds after smoking a knotweed blunt I was flying high man, I started licking walls and eating dog food. When I came to I'd blown a load in my pants and had to throw out my boxers. Put me in a state of vegetative regeneration for a week. It was well worth the sacrifice

Sucks

Please tell us in imperial what the measurements are, feet and inches please, the foreign crap is meaningless.