Using Coffee Grounds to Keep Mosquitoes Away

Mosquitoes are not just a problem because they bite but are also a menace since they transmit vector-borne infectious diseases like malaria, dengue, chikungunya, zika virus etc.

To eliminate and restrain the infestation of mosquitoes, a lot of commercial products such as mosquito repellants which contain chemicals that are harmful for the environment and humans, are being used. A safer solution may be found amongst the organic and non-pollutant materials available in nature.

Does burning coffee grounds keep mosquitoes away?

While there are many ways to keep mosquitoes away but there is a lesser-known yet effective method which involves burning coffee grounds to repel mosquitoes. This is somewhat eco-friendly and safe method as compared to harsh chemicals and sprays.

Later in this article, we will be explain how burning coffee ground works, its effectiveness, and how you can use this in your home and backyard.

Why use coffee grounds as a mosquito repellent?

1. Eco-friendly, Natural and Safe Alternative, yet Effective

Coffee is very common and safer alternative available at every home. Instead of discarding the used grounds you can reuse them as a mosquito repellent. This also reduces waste to some extent.

Also, coffee grounds are natural and biodegradable compared to synthetic compounds used in sprays, lotion and coils, etc. which leaves harmful residues in the environment and also causes skin-rashes and breathing difficulties in many cases.

2. Cost Effective

Many commercially available mosquito repellents are cost wise expensive as they need to be used frequently, and therefore falls hard on your pocket. While the used coffee grounds are available free of cost as a waste.

3. Pleasant Aroma

Chemical based products usually comes with strong unpleasant odor and are very strong and may also cause serious skin issues among people who can be allergic to these. While the coffee grounds on burning, produces a mild pleasant aroma that is actually more preferable.

In case of of camping and outdoor gatherings like one in your backyard or lawn, you can keep mosquitoes away from your guests without any inconvenience of harsh odor.

Science behind burning coffee grounds for mosquitoes

Burning coffee grounds for mosquitoes: Coffee contains compounds and chemical agents that effectively works as a mosquito repellent. These are:

Effective Compound	Effects
Caffeine	Caffeine has insecticidal properties and according to researches published in Journal of Agricultural and Food Chemistry, caffeine can inhibit the growth of mosquito larvae. This results in disruption in their breeding and infestation process. Thus, reduces the overall mosquito population.
Diterpenes	These are also potentially insecticidal in nature and found in the oils of coffee beans. On burning coffee grounds, diterpenes are released adding to the overall mosquito repelling efficiency of the coffee grounds.
Polyphenols	Polyphenols have antioxidant properties and research studies published in Journal of Insect Physiology have been found that they actually interferes the biological growth processes of insects and mosquitoes, by disrupting the molting process in mosquitoes thereby reducing their survival rates.

How burning coffee grounds repel mosquitoes?

The burning of coffee grounds produces various chemical compounds which include carbon dioxide (CO2), nitrogen oxides (NOx) and aromatic hydrocarbons.

A research study in the Journal of Vector Ecology has been found that the smoke released while burning coffee grounds interferes the ability of mosquitoes to locate hosts or humans. This is because the mosquitoes generally locate hosts by detecting their smell, body odor and carbon dioxide released, and when coffee grounds are burned the smoke interferes and confuse their olfactory receptors. As they fail to locate hosts, they generally leave the smoky area.

How to prepare and burn coffee grounds for mosquito control

There are few steps that you can follow to effectively make use of burning coffee grounds to keep mosquitoes away:

Step#1: Collecting Coffee Grounds

You can collect from your daily coffee brewing or can ask from the local cafes for used grounds. Since, these collected grounds can be moist specially the freshly brewed ones, so the next step is to dry them. The moist coffee grounds cannot be burned effectively and will hinder the actual process.

Step#2: Drying the collected Coffee Grounds

Take some newspaper or a flat sheet and spread the grounds over it. Lay down in an open area or under sunlight to air dry for couple of days. For faster drying you can make use of oven and dry under low temperature (200^o F or 90^o C). Once it gets completely dried, it’s texture changes and becomes crumbling.

Step#3: Transfer the grounds into a Container

Now transfer the dried coffee grounds in an open metal bowl or container. Place 2 to 3 layers of normal paper which will help the grounds while igniting. While the container should be fire resistant to avoid catching fire and any related fire accidents.

Step#4: Igniting the Coffee Grounds

Ignite the pile of the coffee grounds with the help of paper below it. It will catch fire easily and the grounds will start burning and smoldering, with a slow release of smoke. The flame should not be intense and open, otherwise you may need to gently blow air to subside the flames.

Allow the grounds to slowly smolder with the heat and it will release the smoke as required.

Step#5: Place it near the desired location

Finally, you can place the container near your sitting position like below the coffee table in your garden or lawn, or any suitable outdoor location. For larger and more open areas where there are green grasses, trees and plants around, you may need to place more number of containers at different locations.

To boost the repellent effect you can also add other natural mosquito repellents like:

Citrus Peels: Dried citrus peels from oranges, lemons and limes can be added as they contains essential oils with mosquito repelling properties.

Bay Leaves: Bay leaves are also known for their insect repelling properties and when they are added to the coffee grounds they will repel mosquitoes more effectively.

Rosemary: Rosemary dried herbs can also be added to the coffee grounds as they are also not liked by mosquitoes and they give pleasant smell to the smoke on burning.

Misconceptions about Burning Coffee grounds for Mosquitoes

Myth #1: Coffee grounds kill mosquitoes

Fact: The coffee grounds on burning release certain compounds that inhibits the growth of mosquitoes and larvae and not actually kills them. And while burning coffee grounds you are just keeping them away from you and not killing them.

Myth #2: It’s effectiveness increases when you burn more coffee grounds

Fact: Burning large quantities of coffee grounds will create huge smoke that will be harmful if inhaled for longer times. Also, some breathing difficulty and allergic reactions may be faced by some individuals. It is better to burn moderate amount of coffee grounds to enjoy your outdoor gathering. Also, keep your surrounding with proper ventilation to allow exit for any excess smoke.

Myth #3: Burning coffee grounds will repel all insects

Fact: Mosquitoes actually have sensitivity towards the compounds present or released while burning coffee grounds. So, other insects may not have similar sensitivity and may not be affected with same effectiveness.

Safety Tips and Health Considerations

As compared to chemical based mosquito repellents, burning coffee grounds is a safer and biodegradable option where you actually repurpose the coffee waste as a useful substitute. But, the burning process generates smoke which also contains particulate matter that may cause respiratory issues if inhaled for a long time. Therefore it is advisable to use in open and well ventilated spaces.

Some individuals may show allergic signs like coughing, sneezing, skin or eye irritation, etc. In that situation, it is advisable to discontinue or get away from the smoke immediately.

Any thing or a matter when burnt releases smoke and so this coffee ground’s smoke also causes air pollution to some extent and can deter the air quality of certain areas where air quality is already poor.

Where actually we can use coffee grounds to keep mosquitoes away?

This mosquito coffee hack is very popular among peoples who prefer to enjoy in outdoor locations as mentioned below:

1. Community Gardens:

Community gardens in many states of USA, have successfully used coffee grounds in mosquito habitats. Also, the coffee grounds can enrich the soil in such gardens.

2. Backyard gatherings:

Number of outdoor activities like summer cookout, barbecues and pool parties can be held safely without any fear from the mosquitoes. Many home owners from Texas, Miami, etc. have adopted the use of coffee grounds successfully.

3. Campsites:

Campers and Travelers have started making use of such safer and pocket friendly alternatives specially for open areas where the strong commercial repellents are also becomes less effective and yet expensive. Also, found useful against ants and flies to some extent.

Conclusion

The mosquito coffee hack of using coffee grounds to get rid of mosquitoes has been found to be very promising and yet effective alternative. Being, cost effective and bio-friendly alternative as compared to commercial mosquito repellents.

The method of controlling mosquitoes and keeping them at bay using coffee grounds has some heath consideration also, which we should not ignore in case we have infants and toddlers around.

The process of burning coffee grounds is very easy and pocket-friendly, where you are using waste instead of harsh and strong chemical agents.

We have also seen some myths about coffee grounds that we have cleared with facts above.

We will surely, bring more about coffee grounds and compare with other natural mosquito repellents in our upcoming articles on our blog.

Frequently Asked Questions (FAQs)