Mad About Berries

Will Bleach Kill Lawn Grass?

Many homeowners might inadvertently reach for household solutions like bleach to tackle outdoor issues, but did you know bleach can significantly harm your lawn?

Sodium hypochlorite, commonly found in bleach, can have devastating effects on your green oasis. From chlorine toxicity to altering soil's pH balance, bleach is a threat to your grass, making it very important to seek environmentally friendly alternatives.

Published: August 21, 2023.

Can Bleach Kill Lawn Grass?

Quick Answer: Yes, bleach (sodium hypochlorite) can kill lawn grass if applied directly...

And now, a little bit longer answer ...

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The chlorine in bleach can cause damage to the grass blades and the soil, disrupting the cellular processes and essentially "burning" the grass. Here's why:

  • Chlorine Toxicity: When bleach is poured onto grass, it can break down and release chlorine. This chlorine is toxic to plants. Chlorine can interfere with photosynthesis and prevent the grass from making the food it needs to survive.
  • pH Levels: Bleach is alkaline, and when it's applied to the soil, it can raise the soil's pH to levels that are not conducive for grass growth. Most lawn grasses prefer slightly acidic to neutral pH levels. Altering this can hinder the grass's ability to absorb essential nutrients from the soil.
  • Osmotic Stress: Bleach can create osmotic stress, drawing moisture out of plant cells and leading to dehydration.

What To Do When Bleach Is Spilled On The Lawn?

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If bleach is accidentally spilled on the lawn, it's a good idea to immediately dilute the area with plenty of water to help mitigate the damage.

If the grass turns brown or dies, you might need to reseed or replace that section of the lawn.

However, it's essential to avoid purposely using bleach as a weed or grass killer due to its environmental impact.

Bleach can harm beneficial microorganisms in the soil, contaminate groundwater, and negatively affect surrounding plants. There are more environmentally friendly methods and products available for weed and grass control.

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How To Use Bleach To Kill Weeds And Grass?

Using bleach to kill weeds and unwanted grass in places like cracks in driveways and pavements and similar can be effective, but caution should be exercised due to the potential environmental impact. If you decide to use bleach for this purpose, follow these steps:

Safety First

  • Wear protective gloves and safety glasses.
  • Make sure the area is well-ventilated if you're working in an enclosed space.
  • Keep children and pets away from the treated area until it's dry and has been thoroughly rinsed.

Prepare the Solution

While undiluted bleach is most effective, it can be very potent. You can dilute it with water if you prefer, but remember that the more you dilute, the less effective it will be. A common ratio is 1 part bleach to 2 parts water.


Pour or spray the bleach solution directly onto the weeds or grass you want to kill. Aim to apply it during the hottest part of the day when the sun can intensify the effect.

Be careful not to splash the bleach on desirable plants or surfaces, as it can cause discoloration or damage.


Within a day or two, you should notice the weeds and grass turning brown and dying.

Clean Up

Once the weeds and grass have died, you can pull them out easily.

Rinse the area thoroughly with water to dilute and wash away any remaining bleach residue. This step is crucial to avoid residual bleach from flowing to areas where you don't want harm or entering water systems when it rains.

Consider a Natural Barrier

After removing the dead plants, consider placing a natural barrier like mulch, gravel, or salt to discourage regrowth in those areas.

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While bleach is an effective killer of weeds and grass, it's not a selective herbicide, meaning it will kill most plants it comes into contact with.

It can also be harmful to the environment. Before using bleach, consider other eco-friendly alternatives or natural herbicides available in garden centers.

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