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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePlants can add fragrance, cooking ingredients, flowers, and structure to a backyard, but the evidence does not support relying on plants growing nearby to repel mosquitoes. A 2026 field evaluation found no reduction in host-seeking mosquito catches from citronella-scented geranium or prostrate rosemary, including when the plants were mechanically damaged. For bite prevention, remove standing water and use an EPA-registered repellent according to its label.
Choose herbs and ornamentals for the garden benefits you want, not as a protective barrier around a patio. Essential oils may have repellent activity when extracted and formulated, but that does not show that an intact plant protects people at patio distance.
What the evidence says about mosquito-repelling plants
Some plants contain compounds with repellent activity in extracted or concentrated form. That is different from a living plant sitting in a bed or pot. Iowa State University Extension says plants placed in the landscape do not work as mosquito repellents. A 2026 field study directly evaluated citronella-scented geranium and prostrate rosemary and found neither reduced mosquito catches compared with controls, whether the plants were left passive or mechanically damaged.
The study first screened six plants in laboratory tests: white yarrow, lemongrass, lavender, prostrate rosemary, white sage, and citronella-scented geranium. The researchers selected geranium and prostrate rosemary for field testing because they ranked highest in the initial qualitative screening and were readily available. The subsequent field result for those two plants was negative. The evaluation covered replicated urban and rural trials over 16 weeks, so it is useful evidence against relying on those plants under the tested conditions, not proof about every plant, site, or mosquito population.
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- Labeled for organic gardening by the usepa
Citrosa, or Pelargonium citrosum, is sometimes sold as a “mosquito plant,” but it is not citronella grass. A 1996 field study found no significant difference in bites between citrosa-treated and untreated subjects. In that same study, a 75% DEET formulation reduced bites by more than 90% for up to eight hours. Those are study-specific findings, not a guarantee for every product or use.
Choose plants for garden value, not mosquito protection
If you enjoy herbs and fragrant plants, grow them for their culinary, ornamental, or pollinator value. Basil, mint, rosemary, thyme, lavender, lemongrass, citronella grass, and scented geranium can all have a place in a backyard plan when suited to the site and climate. Their presence should not be presented as a substitute for mosquito control or personal protection.
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Plan planting around sunlight, soil drainage, mature size, maintenance, and whether a plant may spread. Keep mint contained if you do not want it to spread through a bed, and check local guidance before choosing plants that may be invasive in your region. Plants in pots should have drainage holes, and saucers should not be left holding water.
Comparison: personal protection and yard source control
| Approach | Purpose | Where it is used | Evidence and use guidance |
|---|---|---|---|
| EPA-registered personal repellent | Reduce bites on a person | Skin or clothing, as directed by the product label | CDC recommends proven EPA-registered repellents. Listed active ingredients include DEET, picaridin, IR3535, oil of lemon eucalyptus (OLE), para-menthane-diol (PMD), and 2-undecanone. |
| Emptying and managing water-holding items | Reduce places where mosquitoes can breed | Containers and other water-holding items around the yard | CDC recommends weekly emptying and scrubbing, turning over, covering, or discarding items that hold water. |
| Larvicide dunks or bits | Target mosquito larvae in water that cannot be removed or covered | Small bodies of standing water, following product directions | CDC describes homeowner use when water cannot be removed or covered. Follow the product label; these products are not personal repellents. |
| Ornamental or culinary plants | Add fragrance, food, flowers, or garden structure | Beds and containers selected for growing conditions | Do not rely on plants, including damaged plants, as a proven protective zone against mosquitoes. |
What to do in a backyard to keep mosquitoes away
- Once a week, check the yard for items that collect water. Empty and scrub, turn over, cover, or discard them as appropriate. Include plant saucers, buckets, toys, and other containers.
- If a small body of standing water cannot be removed or covered, consider a mosquito larvicide dunk or bit intended for that use. Follow its label exactly and do not apply more or more often than directed.
- For personal bite prevention, use an EPA-registered repellent according to its label. CDC-listed active ingredients include DEET, picaridin, IR3535, OLE, PMD, and 2-undecanone.
- Choose plants for their garden purpose and growing conditions, not as a substitute for source control or personal protection.
CDC recommends “Use proven EPA-registered insect repellents.” Do not assume that a plant containing a potentially active oil is equivalent to a tested, registered product. CDC notes that unformulated pure oil of lemon eucalyptus has not undergone validated safety and efficacy testing and is not EPA-registered as an insect repellent.
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FAQ
Do mosquito-repelling plants actually work?
Evidence does not support relying on plants placed in a landscape to repel mosquitoes. Iowa State Extension says they do not work as landscape repellents, and a 2026 field study found no reduction in mosquito catches from citronella-scented geranium or prostrate rosemary, even when damaged.
What plants repel mosquitoes when planted nearby?
The dossier does not establish that any plant growing nearby provides reliable mosquito protection. Grow plants for food, fragrance, flowers, or other garden value rather than as a mosquito barrier.
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- Kills Mosquito Larvae Before They're Old Enough To Bite
- Organic Lasts Up To 30 Days
- Each Dunk covers 100 square feet of surface area
- The only product with BTI, a bacteria toxic only to mosquito larvae. Non-toxic to all other wildlife, pets, fish, and humans
Does citronella geranium repel mosquitoes?
A 2026 field evaluation found that citronella-scented geranium did not reduce host-seeking mosquito catches compared with controls, including when mechanically damaged. Citrosa is not the same plant as citronella grass.
Is a mosquito plant the same as citronella grass?
No. Citrosa, or Pelargonium citrosum, is marketed as a “mosquito plant,” while citronella grass is a different plant. A 1996 field study found no significant bite difference between citrosa-treated and untreated subjects.
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- Each Chunk kills mosquito larvae for 30 days or more.
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- Each Chunk covers up to 25 square feet of water, regardless of depth for 30 days or more
- Perfect for bird baths, rain barrels, stock tanks - in any standing water
- Does not affect beneficial insects, honeybees, tadpoles, dragonflies, or anything else
What can I do in my backyard to keep mosquitoes away?
Check water-holding items weekly and empty and scrub, turn over, cover, or discard them. If small standing water cannot be removed or covered, CDC says homeowners can use larvicide dunks or bits according to the label. For personal protection, use an EPA-registered repellent as directed.
Is pure oil of lemon eucalyptus the same as an EPA-registered repellent?
No. CDC says unformulated pure oil of lemon eucalyptus has not undergone validated safety and efficacy testing and is not EPA-registered as an insect repellent. Follow product labeling and choose an EPA-registered repellent for personal protection.
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