HomeBest and Top of GardeningAmazing Listerine Uses In Garden That Works | 7 Mouthwash Uses

Amazing Listerine Uses In Garden That Works | 7 Mouthwash Uses

Not only to protect your teeth, but you can also use mouthwash to protect your garden. Find out 7 amazing Listerine Uses in the Garden!

Are mouthwashes like Listerine harmful to plants?

So far, there is no evidence or reports that suggest that mouthwash can be toxic to plants. On the contrary, there are mouthwash uses that are beneficial for the plants.
For example, orchids, you can use Listerine on orchids suffering from bacterial infections and crown rot. Spray the undiluted mouthwash directly on the infected part.
Also, spraying Listerine (follow the recipe in point number one) on roses affected by black spots helps to control this fungal disease.

1. Get Rid of Powdery Mildews and Other Fungal Infections

Mouthwash has strong anti-fungal properties. It can be used to get rid of powdery mildew and other fungal infections from your garden. For this, mix 75% of water and 25% of mouthwash to make a working solution and spray it on the infected parts.

2. Prevent Cats From Peeing

Most cats have this irritating habit of peeing on the furniture, in corners, or near the plants. You can use mouthwash to stop the problem of inappropriate urination. All you need to do is mix water and mouthwash in equal proportion (Or apply the mouthwash undiluted) and spray it at cat peeing sites. The smell may not be that subtle for a human nose, but it is too intense for the cats, and therefore they avoid the sprayed spots.
*You can apply the same trick to dogs.

3. For Aphid Control

If you’re looking for a harmful-chemical-free way to control aphids, mouthwash can be an effective ingredient. Just add water and mouthwash in equal proportion and spray it on the plants suffering from aphid infestation. You can also add a similar amount of mild liquid dish soap to make this recipe even stronger.

4. Mouthwash Fertilizer

One of the quirkiest Listerine uses–you can make a homemade lawn fertilizer using other ingredients. Make a combination of mouthwash, Epsom salt, liquid dish soap, and Ammonia, 1 cup each, and a can of beer. Apply it using a 20-gallon hose-end sprayer. Use it once every three weeks!

Another Listerine fertilizer recipe has the following ingredients, 1 cup each–Mouthwash, Epsom salt, Ammonia, and mild liquid dish soap. Mix all of them well and transfer the fertilizer into a 20-gallon hose-end sprayer. Apply this to your trees, shrubs, and foliage plants like hostas, ferns, etc.

5. Listerine Mixture for Mosquitoes

Use Listerine to get rid of mosquitoes when you’re enjoying time outdoors. Mist the surrounding area and air around you, especially where mosquitoes are buzzing the most. Lightly mist it on your exposed skin as well.
This is not as effective as commercial mosquito repellants and DEET, but it is safer and works because Listerine contains eucalyptol, a derivative of eucalyptus oil, in a low amount. *Eucalyptol is used as a key ingredient in Eucalyptus-based mosquito repellants.

6. Get Rid of Foul Odors

Get rid of foul odors in your garden using mouthwash. Make a solution of mouthwash and water in equal proportion and apply it at the affected site. This solution will kill the acting bacteria and other microorganisms that function in the rotting process and fill the place with a freshening smell.

7. Listerine to Disinfect Garden Tools

This is the last hack in our mouthwash uses garden. You can use Listerine to disinfect garden tools. Simply soak them for one minute, or spray full-strength Listerine on your smaller garden tools to disinfect them to prevent disease.


  1. Who knew Listerine had so many uses. It is a permanent fixture on our bathroom but I was not aware it was so versatile. Fabulous post on the ingenious uses of Listerine. Thanks for sharing!

  2. I have a serious infestation & a widespread of fungus. I was thinking of adding it to my neem oil sprayer. Do u think this is bad choiice.??

    • Don’t add it to Neem oil, it will break it down and render it useless. However putting Listerine and water in the sprayer is OK.

  3. The brown Listerine works great on dogs with hotspots as well. Mine gets them once in a while so I shave the area to air it out and apply Listerine 2-3 times a day until it scabs up and then it heals within a week or so.

    • Very informative, I will be using this for many of my problems cats to plants ending with a beautiful green lawn. Eliminating mosquitos from yard. Just from my Listerine, WOW, who new.

  4. I have a hibiscus in the house that keeps getting whites flies and the eggs on it, will listerine work on it, willing to try anything

  5. I’ve used this formula (1cup each of Listerine, dish soap, Epsom salts, household ammonia and a bottle of beer) on my lawn for years. Put it in a hose end sprayer and spray at 25:1 over about 2500 sq ft. In 2 weeks you’ll have the greenest lawn you’ve ever had!

  6. Hi, is there anything i can use for termites. My trees been invaded by termites..i do not want to cut the tree because it gives good fruits..e.g. mango tree

  7. Will Listerine be affective as a spray to be used to eliminate those little tiny gnats I have everywhere I guess from of my house plants?


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