Strongest weed killer

pjran

Hi, we need some help please. What’s the strongest weed killer to spray on a large paved back yard where huge weeds are growing? The slabs were put down years ago without any suppressant so my daughters garden looks like a jungle. There are big gaps where the weeds grow freely.

[Deleted User]

Hi,


google 'Rosate', it's a concentrate, dilute to required strength, best sprayed on 'living' weeds, so cut down/remove as much of the jungle as you can and then spray, takes about a week/ten days to get to the roots.

FabFifty

Once you've got the weeds under control I find that brushing rock salt into the gaps helps to keep weeds down.

Browntoa

https://www.pitchcare.com/shop/professional-weed-killers-for-japanese-knotweed/rosate-360-tf-5l-glyphosate.html

Mojisola

Browntoa wrote: »

https://www.pitchcare.com/shop/professional-weed-killers-for-japanese-knotweed/rosate-360-tf-5l-glyphosate.html

Small print -
The purchaser and/or end users are responsible for ensuring that these products are used in line with industry Approved Codes of Practice. All operators must be trained and certificated in using and applying any Ministry Approved professional product.

Please be aware that by proceeding you are purchasing a professional pesticide product.

You must ensure the end user of these products complies with the DEFRA/HSE Code for the Safe use of Pesticides:

"By law, everyone who uses pesticides professionally must have received adequate training in using pesticides safely and be skilled in the job they are carrying out."

Justagardener

What’s the strongest weed killer to spray on a large paved back yard where huge weeds are growing?

It is very important to kill these weeds slowly, any weed killer containing 360g/l or more of glyphosate will do the job. This is a professional strength but can be bought from Amazon without a certificate
https://theperfectgarden.co.uk/the-best-weed-killers-for-your-garden-and-how-to-use-weed-killers-successfully/

pjran

Thank you all. My daughter hasn’t pulled them up! Looks like that’s another job for us, ah bless

DaftyDuck

By the way, don't be tempted to make an extra-strong concentration when you dilute, thinking it will kill them more effectively. It won't! The partial early-death of surface leaves and stems limits uptake and transport to the roots, actually reducing the overall efficacy.

Beset concentration is as the packet suggests. Under certain circumstances, a more dilute concentration can be more effective, but that's complex.

moonshine

I use Clinic Ace, which is a glyphosate weedkiller, and which always works very effectively.

frankie

I have used Rosate with good effect. As said mix as per instructions.

Rosate available on ebay.

Davesnave

Mojisola wrote: »

Small print -
The purchaser and/or end users are responsible for ensuring that these products are used in line with industry Approved Codes of Practice. All operators must be trained and certificated in using and applying any Ministry Approved professional product.

Please be aware that by proceeding you are purchasing a professional pesticide product.

You must ensure the end user of these products complies with the DEFRA/HSE Code for the Safe use of Pesticides:

"By law, everyone who uses pesticides professionally must have received adequate training in using pesticides safely and be skilled in the job they are carrying out."

While 360g/l glyphosate may be a professional weedkiller, it's still one of the safest products from an environmental POV and buying it as concentrate is far more MSE than purchasing ready mix.


As Dafty points out, there is no point in altering the dosage to make it stronger, but the public still search for the 'strongest' as per the thread title.

There's a lot of confusion about chemical weedkillers and the government isn't really keen to enlighten anyone, as it's easier to just ban stuff, even when there is no adequate substitute (see the Asulox fiasco). The problem then is that more people will go for 'home recipes' from the Internet.

Anyway, that's why I got my pro certificate recently, just in case. It was either that, or stockpile enough to last till I'm no longer sentient.....and (I hope ) the cert was cheaper!