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Killing weeds

I have used Rosate 360 ( 25ml per litre water) on weeds in-between cobbles about 5 weeks ago and they are growing back already. What’s the best remedy to get rid of these for longer. Thanks

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  • Pete.8Pete.8 Posts: 11,340
    Rosate 360 is about the strongest form of glyphosate available.
    If weeds are re-appearing then it's probably from seeds that were there already. Glyphosate only kills plants that are alive and growing, it has no effect on un-germinated seeds.
    For longer-term weed clearance you could try Weedol Pathclear.
    That kills living plants and prevents seeds from germinating.
    It's getting a bit late in the season for use now, but it may be worth a go.

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • Thanks Pete, I’ll give it a go 
  • KiliKili Posts: 1,104
    edited September 2022
    I have a 1lt bottle of glyphosate with 360 written on it. If it states 360 on the bottle does that mean its the strong root killing stuff?

    'The power of accurate observation .... is commonly called cynicism by those that have not got it.

    George Bernard Shaw'

  • Pete.8Pete.8 Posts: 11,340
    Kili said:
    I have a 1lt bottle of glyphosate with 360 written on it. If it states 360 on the bottle does that mean its the strong root killing stuff?
    Yes - it's a systemic herbicide so it is absorbed through the leaves and only the leaves, not the roots.
    Once absorbed it will kill the entire plant.
    Some plants with waxy leaves - e.g. ivy may take 3 applications.
    It also only works when plants are actively growing - Mar-Sept.
    I used some on some hidden large docks a few days ago and they're dying back already.

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • I have used Rosate 360 ( 25ml per litre water) on weeds in-between cobbles about 5 weeks ago and they are growing back already. What’s the best remedy to get rid of these for longer. Thanks

    Grout between the cobbles.

    It needs to be renamed as grass killer and weed postponer really as that is what it generally does. 
  • KiliKili Posts: 1,104
    Pete.8 said:
    Kili said:
    I have a 1lt bottle of glyphosate with 360 written on it. If it states 360 on the bottle does that mean its the strong root killing stuff?
    Yes - it's a systemic herbicide so it is absorbed through the leaves and only the leaves, not the roots.
    Once absorbed it will kill the entire plant.
    Some plants with waxy leaves - e.g. ivy may take 3 applications.
    It also only works when plants are actively growing - Mar-Sept.
    I used some on some hidden large docks a few days ago and they're dying back already.

    Thanks for the info @Pete.8 I saw a youtube video where a forester in the US went round killing excess trees which kept springing up by using an axe to make a single chop into the bark about waist high and then using a single spray of 360 and said that would kill the tree. 

    I have a friend who wants to kill a privet hedge without chopping it down so wants to use 360. Would he spray the leaves or chop the bark and spray there, what do you think?

    'The power of accurate observation .... is commonly called cynicism by those that have not got it.

    George Bernard Shaw'

  • Pete.8Pete.8 Posts: 11,340
    edited September 2022
    All forms of glyphosate need to be absorbed by the plant.
    I have heard of of cutting into a tree and applying glyphosate to the cut - presumably the arterial system within the tree transfers the glyphosate throughout the tee and does the job.
    It's not something I have any experience of doing, so I have no idea if it actually works.

    If it were me, I'd spray the leaves of the privet - but when it's actively growing.
    Same goes for cutting into the plant and applying it to the cut.
    This late in the season I don't know if it would work as plants are shutting down now so the glyphosate may not get absorbed by either method.
    One spraying of glyphosate 360 will kill it, but only when it's actively growing.
    If your friend has plenty, they could try asap, but it may be better to wait until spring.
    Also bear in mind it is VERY strong and will kill most plants it lands on, so set the sprayer to small droplets and not a fine mist that may blow around.

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • SYinUSASYinUSA Posts: 243
    I wonder if a product like Preen swept into the cracks would be helpful on cobblestones after spraying. 

    Unrelated to the original question but mentioned in the thread, for anything with waxy leaves, a bit of dish soap mixed into the glyphosate will help the product stick to the leaves rather than repeated applications.
  • Pete.8Pete.8 Posts: 11,340
    When I tried to kill the fencefull of ivy I added some Fairy liquid to act as a wetting agent, but it still took 3 applications over 2 months to kill the ivy.
    I was time-pressured so the ivy may have died off with only 1 or 2 applications, but I had landscapers booked..

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • FairygirlFairygirl Posts: 55,117
    What kind of weeds are they @darlington4AsjVyK0q? If it's horsetail, you'll be struggling to keep it under control long term. The product you have should manage most other weeds well, although you often need a couple of applications. 
    As @Pete.8 says though, if you're getting weed seeds constantly coming in, you'll just have to be vigilant and keep applying as and when you see them, as long as there's enough growth for the product to work on. 
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
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