When and how to kill weeds in your lawn is based upon when they are growing, this means starting in April and finishing as late as early October. 

Don't be tempted to rush into applying lawn weed killer to the whole of your lawned area in the early days as a lot of the weeds will not show their face until much later on in the season, just spot weed early on and even get down and pull them by hand. 

As a rule of thumb we recommend applying weed killer to complete lawns in August and September.


  • Most weed types are still likely to be visible
  • The early seeds will have germinated and therefore you will attack these too
  • In the autumn it is easier as the weeds are not winter hardened
  • Very simply if you kill in autumn you will have a weed free lawn in spring