Plants and Herbs That Mosquitoes Hate

Killo Exterminating Co., Inc. • September 18, 2025

Mosquitoes are not only an irritating nuisance but also a significant health threat in many regions due to their ability to transmit diseases such as West Nile virus, dengue, Zika virus, and malaria. Although chemical repellents and professional pest control services remain essential in many situations, incorporating certain plants and herbs into your landscape can act as a supplementary measure to discourage mosquito activity around your property. This approach is often referred to as "natural mosquito control" and is growing in popularity among homeowners, landscapers, and eco-conscious individuals. Killo Exterminating Co., Inc. is committed to helping clients maintain safer, more comfortable environments through integrated pest management strategies.

Understanding Mosquito Behavior

Before examining the specific plants and herbs, it is helpful to understand why certain vegetation has a repellent effect on mosquitoes. Mosquitoes are attracted to carbon dioxide, body heat, sweat, and body odors. However, they are also highly sensitive to scents released by certain plants and essential oils. These scents can interfere with a mosquito’s ability to locate a host, effectively acting as a natural deterrent.

While planting mosquito-repellent vegetation alone will not eliminate mosquitoes entirely, it can be a valuable component in a multi-layered approach to mosquito control. When combined with proper yard maintenance, water management, and professional pest control services, the following plants and herbs can contribute to a more mosquito-resistant outdoor space.

1. Citronella Grass (Cymbopogon nardus)

Citronella is perhaps the most well-known plant associated with mosquito control. The oil extracted from citronella grass is widely used in candles, sprays, and lotions as a natural repellent. Citronella emits a strong lemon-like scent that masks mosquito attractants.

Citronella grass is a tall, clumping plant that grows well in warm climates and sunny locations. It requires well-drained soil and can be planted in containers or directly in garden beds. While the plant itself has repellent qualities, crushing the leaves releases more of the active oils, making it even more effective in deterring mosquitoes.

2. Lavender (Lavandula spp.)

Lavender is a fragrant herb that not only adds beauty to gardens but also repels mosquitoes. The floral scent, pleasant to humans, is unattractive to mosquitoes and other insects. Lavender contains compounds such as linalool and eucalyptol, which interfere with mosquito olfactory receptors.

This drought-tolerant plant thrives in sunny, dry conditions and well-drained soil. It can be grown in the ground or in pots and requires minimal maintenance. In addition to its mosquito-repellent properties, lavender is known to deter moths, fleas, and flies, making it a versatile addition to any garden.

3. Marigolds (Tagetes spp.)

Marigolds are bright, cheerful flowers commonly used in ornamental gardening. These plants produce pyrethrum, a compound also found in many commercial insect repellents. The strong, pungent aroma of marigolds acts as a natural mosquito deterrent.

Marigolds are easy to grow from seed and thrive in sunny areas. They can be used as border plants or placed in containers near entrances, patios, and outdoor seating areas. In addition to repelling mosquitoes, marigolds are known to deter aphids, whiteflies, and other garden pests.

4. Basil (Ocimum basilicum)

Basil is not only a culinary staple but also a natural insect repellent. The strong scent of basil leaves, especially varieties like lemon basil and cinnamon basil, repels mosquitoes effectively. The plant contains essential oils such as estragole, citronellal, and eugenol, which are known for their repellent properties.

Basil grows well in sunny environments with moist, well-drained soil. It can be planted in herb gardens, flower beds, or containers. For best results, keep the plant close to seating or cooking areas outdoors, where mosquitoes are likely to gather.

5. Peppermint (Mentha piperita)

Peppermint has a refreshing scent and contains high levels of menthol, which is unpleasant to mosquitoes. The essential oil extracted from peppermint can be used as a natural topical repellent, while the plant itself helps discourage mosquitoes from frequenting areas where it is grown.

Mint spreads rapidly and is best grown in containers to prevent it from overtaking other plants. It prefers partial shade to full sun and moist soil. In addition to mosquitoes, peppermint repels ants and spiders, offering broader pest control benefits.

6. Rosemary (Rosmarinus officinalis)

Rosemary is another aromatic herb commonly used in cooking and ornamental gardening. The strong scent of its needle-like leaves repels mosquitoes and other insects, particularly cabbage moths and carrot flies. The plant contains several compounds such as camphor and 1,8-cineole, which contribute to its mosquito-repellent properties.

This evergreen shrub thrives in warm climates and well-drained soil. It prefers full sunlight and can be grown in garden beds or pots. When burned as part of a fire pit or grill, rosemary can release additional aromatic oils into the air, enhancing its repellent effect.

7. Lemon Balm (Melissa officinalis)

Lemon balm belongs to the mint family and emits a strong citrus scent that mosquitoes dislike. The plant contains citronellal and geranial, both known for their insect-repelling characteristics. Lemon balm is easy to grow and is often used in herbal teas and remedies.

Like peppermint, lemon balm can spread aggressively, so it is typically grown in containers. It thrives in partial shade and moist, well-drained soil. Crushed leaves can be rubbed on the skin as a natural repellent, although individuals with sensitive skin should perform a patch test first.

8. Catnip (Nepeta cataria)

Catnip is a member of the mint family and is well known for its intoxicating effect on cats. However, it also contains nepetalactone, a compound that is highly effective in repelling mosquitoes. Studies have shown that catnip oil can be more effective than DEET in certain concentrations.

Catnip grows well in a variety of soil conditions and can tolerate both full sun and partial shade. It is an ideal choice for borders, raised beds, or container gardens. While it can attract cats to your yard, its mosquito-repelling benefits make it a valuable addition to any natural pest control plan.

9. Geraniums (Pelargonium spp.)

Scented geraniums, particularly those with a lemon fragrance, are effective in deterring mosquitoes. The oil produced by the leaves mimics citronella and other strong scents that disrupt mosquito receptors.

These colorful flowering plants grow best in sunny areas and well-drained soil. They can be cultivated in window boxes, hanging baskets, or garden beds. Regular pruning encourages healthy growth and increases the concentration of aromatic oils.

10. Eucalyptus (Eucalyptus spp.)

Eucalyptus trees and shrubs produce oil that contains compounds such as eucalyptol and citronellal. These natural chemicals are widely used in insect repellents and have been shown to reduce mosquito attraction.

While eucalyptus trees are typically too large for small residential landscapes, dwarf or potted varieties are available. These should be grown in sunny, well-drained areas and pruned regularly to maintain a manageable size.

Integrating Plants Into a Mosquito Management Plan

While mosquito-repellent plants and herbs can contribute to mosquito control, they are not a standalone solution. For optimal effectiveness, they should be part of a comprehensive integrated pest management (IPM) plan. Consider the following strategies in combination with natural repellents:

Eliminate standing water, which serves as mosquito breeding grounds.
Install screens on windows and doors to prevent indoor entry.
Use outdoor fans to disrupt mosquito flight patterns.
Maintain your landscape by mowing grass and trimming shrubs.
Schedule regular mosquito treatments with a licensed pest control provider.

Killo Exterminating Co., Inc. provides professional mosquito control services that target mosquitoes at all stages of life. Our team combines advanced technology with environmentally responsible practices to help you reclaim your yard or outdoor space from mosquito infestations.

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How to Deal with a Spider Infestation in Your Attic or Basement

By Killo Exterminating Co., Inc. • September 18, 2025

Discover effective methods to eliminate spider infestations in your attic or basement. Learn prevention tips, removal strategies, and when to contact Killo Exterminating Co., Inc.

How to Get Rid of Rats from Your Yard and Prevent Them from Returning

By Killon Exterminating Co., Inc. • September 8, 2025

Rats are one of the most persistent and destructive pests that can invade outdoor spaces. They are highly adaptable, reproduce rapidly, and are capable of causing significant damage to gardens, property structures, and even personal health. If left uncontrolled, a rat infestation can grow quickly and become far more challenging to address. The key to successful rat control is to remove existing rodents and then implement measures that make your yard unappealing to them in the future. At Killo Exterminating Co., Inc., we have decades of experience helping homeowners and businesses protect their property from pests. Understanding the Risks of Rats in Your Yard Rats are not only a nuisance but also a health hazard. They can carry numerous diseases that pose risks to humans and pets, such as leptospirosis, salmonella, and rat-bite fever. In addition to health threats, rats can cause structural damage by chewing through wood, wires, and even soft metals. They also dig burrows that weaken soil stability around gardens, patios, and building foundations. Identifying Signs of Rat Activity Before taking steps to eliminate rats, it is important to confirm their presence. Common signs of rat activity include: Droppings Rat droppings are dark, pellet-shaped, and typically found along walls, near food sources, or in sheltered corners of your yard. Burrows Norway rats in particular dig burrows in soil, under decks, or along foundations. Fresh burrows often have a smooth entrance with loose dirt scattered nearby. Gnaw Marks Rats gnaw on wood, plastic containers, and even outdoor furniture to keep their teeth from overgrowing. Grease Marks Rats often follow the same paths repeatedly, leaving greasy smears on surfaces where their fur brushes against walls or objects. Noises at Night Scratching or scurrying sounds in sheds, under decks, or in walls can indicate rat activity. Once you have confirmed the presence of rats, you can begin targeted removal efforts. Removing Rats from Your Yard Rats are intelligent and cautious, so effective removal requires a methodical approach. 1. Remove Food Sources Rats are attracted to readily available food. Common food sources in yards include pet food left outside, bird seed from feeders, fallen fruit from trees, and unsecured garbage. To reduce food availability: Store garbage in sealed metal or heavy-duty plastic bins with tight-fitting lids. Clean up fallen fruit promptly. Avoid feeding pets outdoors. Use bird feeders with seed catchers to prevent excess spillage. 2. Remove Water Sources Rats require water to survive, and even small amounts can sustain them. Eliminate or reduce standing water by: Fixing leaky outdoor faucets. Emptying bird baths regularly or using models with running water features. Ensuring proper drainage in low-lying areas. 3. Eliminate Hiding Places Rats seek shelter in clutter, overgrown vegetation, and debris piles. Keep your yard well-maintained by: Trimming shrubs and grass regularly. Storing firewood at least twelve inches off the ground and away from buildings. Removing unused equipment or stacked materials where rats could nest. 4. Use Traps Trapping is a safe and effective way to reduce rat populations. Snap traps are commonly used because they kill rats quickly and humanely. Place traps along walls, near burrows, or in areas where droppings are found. Always handle traps carefully and keep them out of reach of pets and children. 5. Professional Rodent Control Services While do-it-yourself methods can help in mild cases, a significant infestation requires professional intervention. At Killo Exterminating Co., Inc., we use baiting programs and exclusion techniques to remove rats efficiently while ensuring safety for your family and pets. Preventing Rats from Returning Once the current infestation is addressed, prevention becomes your primary goal. Rats are opportunistic, so a clean and well-maintained yard makes them less likely to return. 1. Seal Entry Points to Your Home and Outbuildings Even if rats are currently only in your yard, they can easily move indoors. Inspect the exterior of your home and outbuildings for gaps or cracks larger than one quarter of an inch. Seal these with steel wool and caulk, or use hardware cloth for larger openings. Pay special attention to: Gaps around pipes and utility lines Spaces under doors without proper sweeps Openings in vents or crawl spaces 2. Maintain Landscaping Dense vegetation provides shelter and travel paths for rats. Keep grass trimmed and remove any low-hanging tree branches that provide easy access to roofs or attics. Avoid planting thick ground cover directly against building foundations. 3. Keep Waste Secure A consistent waste management routine is crucial. Use bins with lids that lock or clamp shut, and place them on a stable surface to prevent tipping. If possible, store garbage bins indoors until collection day. 4. Monitor Regularly Even after taking preventive steps, it is important to keep an eye out for early signs of rats. Conduct regular inspections of your property, paying attention to areas near fences, sheds, and compost piles. The sooner you detect rat activity, the easier it is to control. Why Professional Help is Often the Best Option Rats are intelligent, adaptable, and capable of avoiding poorly placed traps or ineffective deterrents. A small population can quickly grow, as rats can reproduce every few weeks. Professional exterminators bring specialized knowledge, tools, and products that are not available to the general public. At Killo Exterminating Co., Inc., we use integrated pest management strategies that address the root causes of infestations rather than just treating the symptoms. This approach combines targeted trapping and preventive measures to deliver long-term results. Health and Safety Considerations When dealing with rats, it is essential to protect your health. Always wear gloves when handling traps or cleaning areas where rats have been active. Avoid sweeping or vacuuming droppings, as this can release harmful particles into the air. Instead, use disinfectants to wet contaminated areas before carefully cleaning them. Dispose of dead rodents according to local guidelines to avoid spreading disease. The Long-Term Benefits of a Rat-Free Yard Eliminating rats from your yard does more than protect your garden and property. It creates a safer and healthier environment for your family, pets, and guests. Without rats, you reduce the risk of property damage, avoid costly repairs, and maintain a more pleasant outdoor space. By following the steps outlined above and working with trusted professionals like Killo Exterminating Co., Inc., you can achieve long-term control and prevent future infestations.