Tyler Brooks
Citronella candles have been touted as a natural mosquito repellent, but their effectiveness has been called into question. While citronella oil, derived from grasses, has been used for centuries to ward off insects, the protection offered by candles alone is limited. Studies suggest that the repellent effect of citronella candles may only last a few hours and is most effective in the immediate area surrounding the candle. This has led some to conclude that citronella candles are ineffective and that other methods, such as EPA-approved repellents, are more successful in preventing mosquito bites. However, others suggest that citronella candles can be useful as part of a multi-layered approach to mosquito control.
| Characteristics | Values |
|---|---|
| Effectiveness | Citronella candles are not very effective in keeping mosquitoes away. |
| Safety | Citronella candles are non-toxic. |
| Alternative uses | Citronella candles can be used as a silent low-tech bug zapper. |
| Alternative deterrents | More effective mosquito deterrents include nets, bug repellent, and fans. |
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What You'll Learn
Are there any effective non-toxic bug repellents?
Citronella candles, though popular, are not very effective in keeping mosquitoes and other bugs away. While citronella oil—an essential oil distilled from dried cultivated grasses—has long been regarded as a "natural" mosquito repellent, there are several other non-toxic alternatives that are more effective.
One of the most effective non-toxic ways to keep mosquitoes away is by running a household fan. This method is especially useful when sitting outdoors. However, if you are looking for something more portable, there are several bug repellent sprays that are organic and natural, such as Badger Balm and Anti-Bug Spray. These products are formulated using USDA Certified Organic and 100% natural ingredients, including essential oils with insect-repellent qualities. In a laboratory trial, Badger Balm was found to be highly effective in controlling mosquitoes and stable flies for up to one and a half hours post-treatment, with efficacy remaining high up to three and a half hours against mosquitoes. Similarly, the Anti-Bug Spray provided an average of 3.4 hours of protection.
Other effective ingredients to look out for in bug repellents include oil of lemon eucalyptus, picaridin, and IR3535. Oil of lemon eucalyptus offers a high level of protection from a variety of biting insects and ticks, has a good safety profile, and is registered with the EPA. Picaridin, developed by Bayer AG in the 1980s, has very low inhalation toxicity, is not known to irritate the skin, and does not have a pungent odor. It also evaporates from the skin more slowly than other common ingredients like DEET and IR3535. While DEET is the most common mosquito and tick repellent and is considered safe by many public health organizations, there have been concerns about its potential neurotoxicity to children. However, follow-up studies have not linked DEET to neurotoxicity.
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How do you keep mosquitoes away when outdoors?
Citronella candles are popular mosquito deterrents, but they are not very effective at keeping mosquitoes away. A 2021 review by Wirecutter found that these candles do not prevent mosquitoes from entering your yard or multiplying. A 2025 review by the New York Times also found that these candles do not work, despite their promise of keeping pests away.
If you're looking for ways to keep mosquitoes away when outdoors, here are some methods that are more effective:
- Use a fan: Mosquitoes are weak fliers, so a fan blowing below table level can help keep them away from you and disperse the scent of carbon dioxide that attracts them.
- Remove standing water: Mosquitoes lay their eggs in water, so remove any sources of standing water like buckets, empty planters, or dishes. If you have a bird bath, change the water often or use a small pump to circulate the water.
- Plant natural repellents: Plants like lavender, basil, lemon balm, rosemary, thyme, and marigold are known to repel mosquitoes.
- Use bug spray: Typical bug sprays that contain DEET can be effective at repelling mosquitoes. If you prefer a more natural option, essential oils like rosemary, thyme, lavender, and peppermint can also be used as repellents.
- Try spatial repellents: Devices like the Thermacell E65 Rechargeable Mosquito Repeller can help keep mosquitoes away without the need for bug spray. However, they are most effective in still conditions and may not work well in windy areas.
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What are the best ways to keep bugs out of your yard?
Citronella candles, though popular, are not very effective in keeping mosquitoes away. To effectively keep bugs out of your yard, consider the following methods:
Install Fans
Running an ordinary household fan is an effective, non-toxic way to keep mosquitoes away. Mosquitoes are weak flyers, so even a ceiling or standing fan on medium power can be too much for their wings.
Get Rid of Standing Water
Mosquitoes love to lay eggs on standing water, so it's important to eliminate any sources of standing water in your yard. Keep your gutters clean and fill in any sunken areas in your yard to prevent water from pooling.
Companion Planting
Companion planting is an effective way to deter pests. Some plants naturally repel bugs, while others attract beneficial insects that can help control pest populations. Marigolds, for example, keep destructive insects like aphids away and even kill harmful nematodes in the soil. Lavender, chrysanthemum, and lemongrass can also help discourage mosquitoes and aphids.
Encourage Beneficial Insects
Attracting beneficial insects to your garden is a natural and long-term pest control strategy. Ladybugs, spiders, wasps, dragonflies, lacewings, and praying mantises are all effective in fighting against insects that harm plants. You can attract these beneficial insects by growing plants that produce nectar and pollen, such as fennel, dill, cosmos, sunflowers, angelica, and yarrow.
Use Natural Insecticides
Neem oil, derived from the Neem tree, is a natural insecticide and repellent. It affects the feeding and reproduction cycles of many garden bugs, including aphids, mealybugs, whiteflies, spider mites, thrips, and caterpillars. To use neem oil, mix one or two teaspoons of pure neem oil with one liter of water, add a teaspoon of liquid soap, and spray the mixture onto the leaves.
Keep Food Covered
Food left uncovered outdoors can attract a variety of pests, including flies, ants, and mosquitoes. Keep food covered as much as possible, and don't leave it unattended for long periods.
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What are the benefits of citronella oil?
Citronella oil, derived from the distillation of the Asian grass plant in the Cymbopogon genus, has a variety of benefits. Its most well-known benefit is as an insect repellent. However, its advantages extend beyond pest control.
Citronella oil has been used in China and Indonesia for centuries to treat rashes, infections, and other health conditions. It has antifungal properties that can help weaken or destroy certain types of fungi, such as Aspergillus niger, that can cause health problems. Additionally, it has been found to inhibit 15 out of 22 bacteria in studies, showcasing its antibacterial capabilities.
Citronella oil also has cosmetic and skincare benefits. It can help balance oil production, making it ideal for combating oily skin and hair. Its antiseptic and anti-inflammatory qualities can soothe irritated skin and promote the healing of skin conditions like acne, eczema, and dermatitis. Furthermore, it is believed to have protective qualities that reduce the chances of skin damage caused by UV radiation.
The oil also has detoxifying properties, promoting the expulsion of toxins from the body and enhancing overall health. It is also used as a natural deodorizer and air freshener, providing a refreshing aroma while boosting mood and relieving stress.
While citronella oil has these reported benefits, it is important to note that scientific research in this area is ongoing, and individual results may vary.
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What other citronella products are there?
Citronella candles are popular mosquito-repellent products, but their effectiveness is questionable. While some sources claim that they are moderately effective in the immediate area surrounding the candle, others assert that they are not truly effective in keeping mosquitoes away and preventing them from multiplying.
If you're looking for alternatives to citronella candles, there are several other citronella products available, including:
- Tabletop candles: These are similar to the citronella candles but are designed to be placed on tables, providing a more localized protection against mosquitoes.
- Tiki torches: Tiki torches infused with citronella oil can be placed around outdoor spaces to create a protective barrier against mosquitoes.
- Essential oil diffusers: Citronella essential oil can be diffused indoors or outdoors to repel mosquitoes.
- Repellent bracelets: These bracelets are infused with citronella oil and can be worn on the wrist or ankle, offering a portable and convenient way to keep mosquitoes at bay.
- Ultrasonic devices: These devices emit ultrasonic sounds to repel mosquitoes. However, their effectiveness has been disputed, with some studies indicating that they may not provide significant repellent benefits.
In addition to citronella-based alternatives, there are other effective mosquito repellent options:
- Bug repellent sprays: Sprays containing DEET or oil of lemon eucalyptus have been found to reduce mosquito attraction by up to 60%.
- Clip-on fans: A clip-on fan containing the insecticide metofluthrin was found effective in repelling mosquitoes.
- Bug zappers: These devices use light to lure and kill bugs, including mosquitoes.
- Fans: Ordinary household fans can be used to create a breeze that deters mosquitoes, as they are weak fliers.
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Frequently asked questions
Citronella candles are moderately effective at repelling mosquitoes but only those in the immediate area surrounding the candle. The closer you are to the candle, the less likely you are to be bitten.
Citronella repels insects by obscuring the human scents that attract them, making it harder for mosquitoes to locate their targets. The effectiveness of the candle depends on the concentration of citronella oil.
Some alternatives to citronella candles include fans, bug repellent sprays, and mosquito-repelling plants.
Citronella is an essential oil that comes from a grass plant of the cymbopogon genus (similar to lemongrass). It has a fresh and citrusy aroma and has been used for centuries to ward off bugs.
