Does Mulching Kill Weeds?

Share on:
mulching that kills weeds

Yes, In most cases mulch is enough to stop weeds growth. Weeds require sunlight and warm soil to grow. Mulch blocks the sunlight and helps in leaving the soil cool. So in order to kill weeds, mulch should be 3 to 4 inches thick. The most important thing is how you apply mulch and what type of mulch you have selected for your garden.

Common Mistakes While Applying Mulch

  • Wrong selection of mulch type for the garden.
  • Some people apply directly mulch over the lawn and do not bother to place a newspaper or cardboard layer under the mulch.
  • It’s also wrong practice, Not to water the newspaper layer.
  • Directly apply mulch over weeds and do not bother to pull out them before mulching.
  • Keeping the height of mulch less than 2 to 3 inches.

Keep avoiding these mistakes to kill weeds’ growth after mulching.

Some pesky weeds still grow out from mulch even if you lay mulch properly all over your yard.

Why Do Weeds Grow Out From Mulch?

Sometimes even if you lay mulch properly and accurately weeds still grow out from the mulch. There can be 2 basic reasons for that.

  • Maybe weed seeds are already buried under soil and they grow up. Or birds have distributed them
  • Second is, you may do not have to pluck out weeds (hard weeds) before mulching and they grow out.

Different Ways to Kill Mulch

There can be some additional methods to control weeds growing in mulch.

These methods are

  • Kill weeds using herbicides
  • Sheet mulching for killing weeds in mulch
  • Landscape fabric for killing weeds

1. Kill weeds using herbicides:

Herbicides are useful in killing weeds in mulch. Mulch is an effective method to control weeds and it works best when we use herbicides with mulch.

How to Apply Herbicides to Kill Weeds?

For this purpose first, move mulch aside and pull off all weeds if there is. Apply the pre-emergent herbicides to the area. Follow the method to apply pre-emergent herbicides as different herbicide products have different methods. Also, read any precautions as some plants may get damaged by herbicides.

Now move the mulch all over the yard again. Here you can use herbicides gain. Liquid herbicides may work more effectively as they adhere to mulch.

2. Sheet Mulching for Killing Weeds

Sheet mulching can be a more effective way to kill weeds. Different sheet mulches bear different qualities which help to put weeds out.

3. Landscape Fabric for Killing Weed Growth

Landscape fabric is a method to kill weeds. It is effective and works fine but it’s best to cover the landscape fabric with mulch.

Installation of Landscape Fabric

Installation of landscape fabric is not much hard just buy a good quality landscape fabric. Prepare your yard well. Level it properly so that fabric can cover over properly. Remove any already grown weeds and lay landscape fabric over the yard. Now lay mulch over fabric to kill weeds.

Photo of author


After doing my master’s in agriculture, I went on with this field for more than 15 years because I love working in green. I have experienced using modern machinery and techniques that can help farmers and landscapers to achieve something great. My goal will be to deliver you the best reviews and information to make the right decision.

Leave a Comment