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Regular mowing of lawn will eventually kill couch grass?

Is this true?... I'm happy to mow lawn twice a week if so. 

I have dug out lots on my lawn and plan to seed patches and overseed my lawn as removing some by hand has alerted me that I probably have about 30% of couch grass on my lawn at the minute  

If so, should I mow on my lowest setting ? 


  • glasgowdanglasgowdan Posts: 632
    Not in my experience. Only wiping the clumps with weedkiller, or the whole lawn and restarting, tends to work. 
  • DovefromaboveDovefromabove Posts: 86,969
    I agree with @glasgowdan, coupled with which cutting low seems to suit couch grass while ordinary lawn grass thickens up best if cut regularly at a medium height. 

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.

  • jamiebc1470jamiebc1470 Posts: 26
    edited April 2019
    OK I've decided to Kill my entire lawn off and reseed and start a fresh, it's just everywhere this couch grass and think it's best to do it all than taking the chance of it coming back. 

    What weed killer do you recommend for the job?

    Should I weed kill the whole area again seven days later just to be safe?

    Rake all the dead grass off to bare soil then put a light topping of fresh top soil, fertilise, then seed?

    Sorry for so many questions

    Jamie :) 
  • IamweedyIamweedy Posts: 1,364
    Couch grass is really dreadful. I am not a lawn fan. As long as it is green, but gettiing rid of it is hard work.  Mine is particularly bad after last years drought.

    I think it would take rather longer to kill couch grass than seven days . What were you using to kill it off with?  Sorry but It does not even go yellow for about three weeks, the roots are long and very tough. You are brave. 

    'You must have some bread with it me duck!'

  • jamiebc1470jamiebc1470 Posts: 26
    edited April 2019
    I have roundup, which I was going to use neat, Which made the couch grass go yellow within 24 hours

    What a nightmare this stuff is!! 
  • SkandiSkandi Posts: 1,721
    Roundup takes it at the recommended dose. Our field was sprayed last year to clear it out for wheat, this year I've got a load of veg down and I can really see where new unsprayed ground has been turned, the horrible stuff is coming up everywhere! I wouldn't mind it as much if it didn't literally grow through the vegetables, I've had onions and potatoes with couch grass through the tubers! Just make sure you get any that might be in the flower beds or it will be back. At least it doesn't seed much.
  • Before spraying my lawn with weed killer, does the couch grass need to be a certain hight? To best kill at the roots... Or doesn't it matter what hight it is?

    I plan to spray the whole of my lawn twice, then remove all the turf... Should I turn all my soil over after this and spray the soil again to be safe?

    I'm now going to returf rather than seed to allow us to have a lawn for the summer.

    Thanks for any help... I thought to ask again regards best practice dealing with this stuff as want to make sure it's completely gone. 

    I had walls built in my garden last year and my lawn was seriously neglected and not watered and left to grow, hence why I think my couch grass issue is so bad.. I think my lawn as a guess is 40% couch grass :(
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