If you find that the weeds are recurring past the 6-8-week mark, you may wish to consider using a selective herbicide to spot spray your weeds. Some weed killers such as glyphosate (Roundup) kill more than just weeds, so it is important to not apply these as if they are not done precisely, they can kill your grass. Shop bought selective weed killers will recommend when to apply their product and how often and you should read the instructions thoroughly and adhere to them.
However, you can get rid of these weeds just as fast as they have appeared.
The important thing to remember when new weeds appear in your newly sown lawn is not to act hastily – do not apply a Feed, Weed and Moss Killer type product of any kind on a newly sown lawn.
Although this can be frustrating and we can appreciate that a quick solution will be desired, the good news about these types of weeds is that they are largely shallow rooting and should come out with the first mow at the 6-8 week mark after sowing. If they don’t, they should be easy to pull out of the turf.
In short, here’s what you should do if you encounter weeds in your newly seeded lawn:
If you find that when the lawn is at least six months old and has been taken over by weeds or moss, you can use a Feed, Weed and Moss Killer product.
Eradicating weeds isn’t a task for the fainthearted. It requires elbow grease, persistence and a little intelligence. In order to know your best method to kill any particular weed, you need to understand it — how it grows, when it grows and the best time to attack it. Improve your odds of success by adopting some of these clever, and easy, weed-killing strategies.
In early spring or late fall (even after hard frost), perennial weeds can appear green, which may tempt you to apply herbicide. Don’t be fooled. When temperatures are low, plants aren’t actively growing. During summer’s hottest days, some weeds become dormant as well. Treating weeds with herbicide during dormancy is a waste of time and money. Watch for new leaf formation. That’s the clue to active growth – and the cue to fill your sprayer. For many perennial weeds, such as Dandelion or Bermudagrass, a late summer/early fall spray – just before plants enter dormancy – can prove effective. The chemical is transported to roots, which results in complete kill.
Killing Weeds: Pulling vs. Spraying
As soon as perennial weeds sprout, it’s time to take action. With tap-rooted weeds such as Dandelion, pulling young plants improves your odds of removing the entire root.
Timing Is Critical