Last updated 2026-08-14
TL;DR
Some plants (citronella grass, catnip, lemon-scented eucalyptus, marigolds) contain compounds that repel mosquitoes when crushed or extracted into oil. Growing them in pots does very little on its own; studies find intact plants release almost none of the repellent compound into the air. They're a nice supplement, not a substitute for source reduction and barrier treatment.
What is a mosquito repellent plant, exactly?
A mosquito repellent plant is a plant that produces a compound, usually in its leaves or oil glands, that has been shown in lab or field tests to reduce mosquito landing or biting rates. That's the whole definition. It does not mean the living plant sitting in a pot on your patio is pumping out a cloud of repellent 24 hours a day. This distinction matters more than any list of plant names. The compounds that make citronella, catnip, and lemon eucalyptus effective (citronellal, nepetalactone, and PMD, respectively) are locked inside the plant tissue. You get meaningful repellency when those oils are extracted, concentrated, and applied to skin or a surface. An intact, undisturbed plant releases very little of that oil into the surrounding air. Brush against the leaves or crush them, and you'll notice the smell instantly, which tells you something: the plant isn't broadcasting it passively. So when someone asks what plants repel mosquitoes, the honest answer has two parts. Yes, several plants contain real repellent chemistry. No, buying them at the garden center and setting them around your porch will not create a mosquito-free zone by itself.
What plants repel mosquitoes (and what the evidence says)
Here's a rundown of the plants most often cited, with what's actually been tested versus what's marketing. Citronella grass (Cymbopogon nardus and C. winterianus). This is the source of citronella oil, one of the most studied plant-based repellents. The CDC lists oil of citronella among registered active ingredients for skin-applied repellents, though it generally requires more frequent reapplication than DEET or picaridin to maintain similar protection [1]. The plant itself, grown in a pot, is not the same delivery system as the extracted, concentrated oil in a lotion or spray. Catnip (Nepeta cataria). A widely cited 2001 study from Iowa State University found that nepetalactone, the compound in catnip essential oil, repelled mosquitoes in lab bioassays, and the researchers reported it was roughly ten times more effective than DEET at the concentrations tested [2]. That's a striking lab result. It has not translated into a commercial catnip-oil repellent anywhere close to that potency in real-world, on-skin conditions, partly because nepetalactone evaporates fast and irritates some skin. Lemon eucalyptus (Corymbia citriodora). Oil of lemon eucalyptus (OLE) and its refined active ingredient, PMD (para-menthane-3,8-diol), is EPA-registered and recommended by the CDC as an effective skin repellent when used per label directions [1][3]. Growing a lemon eucalyptus tree in your yard doesn't get you PMD. You need the processed oil. Marigolds (Tagetes species). Marigolds contain pyrethrum-like compounds and a strong scent that some studies suggest deters certain insects, though the mosquito-specific evidence is thinner and mostly anecdotal or small-scale. Lavender, lemongrass, rosemary, basil, mint. All contain aromatic oils that show some repellency in crushed-leaf or extracted-oil lab tests. None have strong field trial data showing a living border planting measurably drops mosquito bites in a yard. The pattern across every one of these: real chemistry, weak delivery from an intact plant. If you like the idea of a lemongrass border or a pot of catnip by the door, plant it. Just don't let it replace anything else you're doing.
Do mosquito repellent plants actually keep mosquitoes out of your yard?
Mostly, no. Not on their own. This is the part garden centers don't put on the plant tag. The repellent compounds in these plants sit inside glandular trichomes or oil cells in the leaf tissue. Mosquitoes are repelled by direct contact with concentrated oil, or by breathing air with a meaningful concentration of the volatile compound nearby, generally within inches. A potted citronella plant on a patio table might create a faint zone of reduced attractiveness in the immediate few inches around the leaves if you brush past it. It is not creating a repellent perimeter around a yard, deck, or even a single seating area. This is consistent with how mosquito researchers talk about spatial repellents generally: effective ones (like certain metofluthrin-based devices) are engineered to volatilize a measured dose continuously into the air. A living plant has no mechanism to do that at a useful concentration. If it did, you'd smell a strong odor drifting off it all day, and you don't. So plant them for the smell, the pollinators, the garden aesthetics, or because crushing a leaf and rubbing it on your ankle in a pinch is genuinely better than nothing. Don't plant them and skip everything else on this page expecting your yard to clear out.
How to get rid of mosquitoes in your backyard
Standing water is the actual lever. Mosquitoes need still water to lay eggs, and most species complete egg to adult in as little as 7 to 10 days depending on temperature and species [4]. Walk your property every few days during the season and dump anything holding water: saucers under pots, clogged gutters, tarps, kiddie pools, old tires, birdbaths that aren't refreshed. The EPA recommends the "tip and toss" approach, literally tipping over containers that collect water and tossing ones you don't need, as a core mosquito control step homeowners can do themselves [5]. For water you can't dump, like ornamental ponds or rain barrels, mosquito dunks containing Bti (Bacillus thuringiensis israelensis) kill larvae without the broader toxicity of adulticide sprays. Bti is EPA-registered specifically for use in standing water and is considered low-risk to non-target organisms including fish and birds when used per label [6]. After you've handled standing water, the next layer is a barrier treatment: a residual spray applied to vegetation, mulch beds, and shaded resting spots where adult mosquitoes hide during the day. These treatments knock down existing populations and keep landing mosquitoes reduced for a period of time; they don't wipe mosquitoes out permanently, since new adults keep migrating in from neighboring yards, ditches, and wetlands. That's why professional programs run on a repeat cycle, typically every 10 to 14 days during peak season, rather than a single application. If you're trying to figure out whether to DIY this or bring someone in, a look at mosquito control options lays out the tradeoffs between backpack sprayers, barrier treatments, and misting systems in more detail.
How to keep mosquitoes away from your patio or deck
For the specific zone where you sit outside, three things actually move the needle: fans, targeted repellent, and eliminating nearby breeding sites. Mosquitoes are weak fliers, and a standard box fan or outdoor ceiling fan creates enough air movement to disrupt their flight and disperse the CO2 plume they use to find you. Skin-applied repellents with EPA-registered active ingredients (DEET, picaridin, IR3535, oil of lemon eucalyptus/PMD, or 2-undecanone) are the only category with solid field data behind them [1][3]. The CDC's repellent guidance notes that products registered with the EPA have been evaluated for efficacy and human safety when used according to the label; the agency does not rate any repellent as risk-free, only as approved for use under specified conditions [3]. Citronella candles and tiki torches provide a mild, localized effect at best; a widely cited field study published in the Journal of the American Mosquito Control Association found citronella candles offered some reduction in landing rates compared to no protection, but far less than DEET-based repellents applied to skin . Treat them as ambiance with a minor bonus, not a control method. If your patio backs up to woods, tall grass, or a drainage ditch, that's your real mosquito source, and no amount of citronella pots will offset it. A natural mosquito repellent approach can help fill gaps between barrier treatment cycles, but it's a supplement, not a replacement.
How to get rid of mosquitoes in the house
Indoor mosquitoes almost always mean one of two things: they're getting in through gaps, or they're breeding somewhere inside like a clogged drain, a forgotten vase, or a houseplant saucer that never dries out. Start with entry points. Check window and door screens for tears, and confirm door sweeps seal fully; a gap as small as an eighth of an inch is enough for a mosquito to slip through. Check under-sink drains, floor drains, and any container holding standing water for more than a few days, since some mosquito species can complete a full life cycle indoors in stagnant water. For mosquitoes already inside, a simple approach works: an aerosol labeled for flying insects, applied per the label directions, handles what's already in the room. It won't do anything about ones still coming in from outside, so pair it with sealing gaps and checking screens. Indoor mosquito problems that persist despite sealed screens and no obvious water source are worth a call to a local pest professional, since it may mean a breeding site you haven't found yet, like a wall void with moisture intrusion.
When do mosquitoes go away for the season?
Mosquito activity generally drops once nighttime temperatures fall consistently below about 50°F, since most species become inactive and adult mosquitoes die off or, in some species, seek overwintering shelter in the egg or dormant adult stage. The exact date varies enormously by region and by species, and there's genuine year-to-year variability even within the same zip code depending on frost timing. In much of the northern US, that's late September through October. In the Gulf Coast, Florida, and much of the Southwest, mosquitoes can remain active nearly year-round in mild winters, and some species overwinter as adults in protected spots rather than dying off completely. Your county extension office or local health department mosquito surveillance program is the best source for typical first-and-last-frost dates and locally observed mosquito activity windows, since national averages don't reflect what's happening in any specific yard. This regional variability is also why seasonal treatment plans get built around 10 to 14 day cycles that run from spring emergence through the first hard frost, rather than a fixed calendar. A cold snap in a normal year and a warm one three years later can shift the effective season by several weeks.
How do you get rid of ticks in your yard?
Ticks and mosquitoes need different tactics because ticks don't fly and don't need standing water; they climb tall grass and brush and wait for a host to walk by, a behavior called questing. The CDC and university extension research both point to the same core yard interventions: keep grass mowed short, clear leaf litter and brush, and create a barrier of wood chips or gravel at least 3 feet wide between lawn and wooded areas or stone walls, since ticks rarely cross a dry, open border to reach a lawn . This is sometimes called tick-scaping. Ticks are strongly associated with the shaded, humid edge habitat where lawn meets woods, and far less common in the open, sunny middle of a mowed lawn. That's a useful mental map for where to actually spend your effort: perimeter first, wide open lawn second. Barrier sprays targeting ticks work on the same residual principle as mosquito barrier treatments, applied to the vegetation edges, stone walls, and shaded brush where ticks quest, not the open lawn. A tick repellent applied to skin and clothing before yard work adds a second layer, especially in high grass or wooded edges during peak nymph season (typically late spring through mid-summer in most of the US, per CDC tick season data) . For pets, check with a veterinarian about a labeled tick preventive, since dogs and outdoor cats can carry ticks back into the house and yard even after the yard itself has been treated.
Do citronella candles and torches actually work?
They work a little, in a small radius, and mostly for landing reduction rather than full protection. A widely cited JAMA Mosquito Control Association trial found citronella candles reduced mosquito landing rates compared to no repellent at all, but the effect was smaller and shorter-lived than DEET-based sprays applied directly to skin . The practical read: light them for ambiance and a modest edge on a calm evening. Don't treat them as your only mosquito plan for a dinner party, especially near dusk when mosquito activity peaks for most common species.
Do bug zappers and ultrasonic devices work?
Bug zappers are largely a myth as mosquito control. Multiple entomology studies going back decades have found that the vast majority of insects killed in electric zappers are non-biting insects like moths and beetles, not mosquitoes, because zappers attract insects with UV light and mosquitoes are drawn primarily to CO2 and body heat, not light. Ultrasonic repellent devices have no solid peer-reviewed evidence supporting the claim that sound frequencies deter mosquitoes; the FTC has taken action against ultrasonic pest repellent marketing claims in the past for lacking scientific support. Skip both categories. Put the money toward source reduction or a barrier treatment instead.
What actually works: a realistic layered plan
| Source reduction (dump standing water weekly) | Cuts larval breeding at the root | EPA tip-and-toss guidance [5] | |
|---|---|---|---|
| Bti dunks in water you can't dump | Kills larvae in ponds, rain barrels | EPA-registered biological larvicide [6] | |
| Residual barrier spray on vegetation, every 10-14 days in season | Knocks down resting adult populations | Standard IPM cycle used by pest professionals | |
| Skin repellent (DEET, picaridin, PMD) for active outdoor time | Prevents bites during exposure | CDC-recommended EPA-registered actives [1][3] | |
| Fans on patios and decks | Disrupts weak-flying mosquitoes | Behavioral, widely recommended by extension services | |
| Repellent plants (citronella, catnip, lemongrass) | Minor, localized supplement | Lab-proven compounds, weak passive release from live plants [2] | Read it top to bottom in terms of impact. Standing water removal and barrier treatment do the heavy lifting. Plants and candles sit at the bottom, nice to have, not load-bearing. If you'd rather not manage the spray cycle yourself, a mosquito control near me search will turn up local services, and Duskproof runs a free yard assessment to map standing water, resting sites, and the barrier or misting setup that fits your property before anything is scheduled. Get a free yard assessment. |
No single tactic clears a yard. The combination that has real evidence behind each layer looks like this: | Layer | What it does | Evidence basis |
Are mosquito repellent plants worth planting at all?
Yes, with the right expectations. They add scent, pollinator value, and a minor, localized deterrent if you crush the leaves and rub the oil on skin or clothing in a pinch. Catnip oil in particular has genuinely strong lab numbers behind it [2]. What they won't do is replace source reduction, barrier treatment, or a skin-applied repellent for anyone spending real time outside at dusk. Think of citronella grass and catnip the way you'd think of a doormat: a nice first layer, not a lock on the door.
Frequently asked questions
How to get rid of mosquitoes for good?
You can't eliminate mosquitoes permanently outdoors; new adults migrate in from nearby wetlands, ditches, and neighboring yards. You can knock populations down hard by removing standing water weekly, treating water you can't dump with Bti dunks, and running a residual barrier spray on a 10-14 day cycle through the season. Combine with skin repellent for full evenings outside.
What plants repel mosquitoes the best?
Citronella grass, catnip, lemon-scented eucalyptus, and lemongrass all contain compounds shown in lab studies to repel mosquitoes, with catnip's nepetalactone tested at roughly ten times DEET's potency in one 2001 Iowa State study. But an intact potted plant releases very little of that oil passively; you get real repellency from extracted, concentrated oil, not from the living plant sitting nearby.
How do you get rid of ticks from your yard?
Mow grass short, clear leaf litter, and build a 3-foot-wide barrier of wood chips or gravel between lawn and wooded edges, since ticks rarely cross open, dry ground. The CDC recommends focusing effort on shaded edge habitat where lawn meets woods or stone walls, since that's where ticks quest for hosts, not the open sunny lawn.
How to get rid of mosquitoes in my house?
Check window and door screens for tears, seal gaps under a quarter inch, and eliminate any indoor standing water like clogged drains or houseplant saucers. For mosquitoes already inside, an aerosol labeled for flying insects handles the immediate problem. Persistent indoor mosquitoes despite sealed entry points usually mean an unfound breeding site worth a professional inspection.
When do mosquitoes go away for the season?
Mosquito activity typically drops once nighttime temperatures fall consistently below about 50°F, which is late September to October across much of the northern US. In Gulf Coast and Southwest regions with mild winters, mosquitoes can stay active nearly year-round. Check your local extension office or health department for typical dates in your specific area.
What is a mosquito repellent plant, exactly?
It's a plant that contains a compound shown in lab or field testing to reduce mosquito landing or biting, like citronellal in citronella grass or nepetalactone in catnip. The term describes the chemistry inside the plant tissue, not a guarantee that the living plant repels mosquitoes from the air around it at a useful range.
Do mosquito plants actually keep mosquitoes away from a whole yard?
No. The repellent oils sit inside leaf tissue and are released passively at very low concentrations from an intact plant. You'd need to crush the leaves or use an extracted oil to get meaningful repellency. A potted citronella plant on a patio gives, at most, a faint effect in the inches right around it.
How to keep mosquitoes away from a backyard party?
Run a barrier treatment or DIY spray on vegetation a day or two before, place fans near seating areas since mosquitoes are weak fliers, and have EPA-registered skin repellent available for guests. Light citronella candles for a minor bonus, but don't rely on them alone, especially near dusk when biting activity peaks.
Do bug zappers actually kill mosquitoes?
Barely. Entomology research has repeatedly found that the large majority of insects killed by electric bug zappers are moths, beetles, and other non-biting insects drawn to UV light, since mosquitoes are attracted primarily to CO2 and body heat rather than light. Skip zappers for mosquito control and invest in source reduction or barrier treatment instead.
How often should a mosquito barrier treatment be reapplied?
Most professional programs run barrier sprays on a 10 to 14 day cycle through the active season, since the residual effect fades and new adult mosquitoes migrate in continuously from surrounding areas. Rain can also shorten the effective window. This is why barrier treatment is framed as ongoing population reduction, not a one-time fix.
Is citronella oil as effective as DEET?
Not quite. The CDC lists oil of citronella among EPA-registered repellent actives, but it generally requires more frequent reapplication than DEET or picaridin to maintain comparable protection against mosquito bites. It's a legitimate registered option, just a shorter-acting one.
What kills mosquito larvae in standing water without harming pets or fish?
Bti (Bacillus thuringiensis israelensis) dunks are EPA-registered specifically for larval mosquito control in ponds, rain barrels, and other standing water, and are considered low-risk to fish, birds, and pets when used according to the label. They don't affect adult mosquitoes already flying, only the larval stage.
Sources
- CDC, Preventing Mosquito Bites: EPA-registered active ingredients including oil of citronella and PMD, and reapplication frequency guidance
- CDC, Mosquito Bite Prevention: Repellents: EPA-registered repellents are evaluated for efficacy and safety when used per label, not rated risk-free
- CDC, Mosquito Life Cycle: Mosquitoes can complete egg-to-adult life cycle in as few as 7 to 10 days depending on species and temperature
- Journal of the American Mosquito Control Association, citronella candle field efficacy study: Citronella candles show measurable but limited landing-rate reduction compared to DEET-based skin repellents
- CDC, Preventing Ticks in the Yard: Wood chip or gravel barriers at least 3 feet wide between lawn and woods reduce tick migration into yards
- CDC, Tick Season and Tickborne Disease Data: Peak nymph tick activity typically runs late spring through mid-summer in most of the US