Last updated 2026-08-14
TL;DR
A mosquito repellent plant contains natural oils (citronellal, geraniol, linalool) that can mask human scent or mildly deter mosquitoes when crushed or brewed into oil. Left growing in a pot, most do very little. Studies on skin-applied plant oils show real but short-lived repellency (20 minutes to a few hours), far less than DEET or picaridin.
What is a mosquito repellent plant?
A mosquito repellent plant is any plant that produces natural compounds mosquitoes tend to avoid, usually aromatic oils like citronellal, geraniol, linalool, or eucalyptol. These oils sit inside the leaves and stems. Just growing the plant in your yard does almost nothing, because the oil has to be released, crushed, rubbed on skin, or distilled into a usable concentration before it interferes with a mosquito's ability to find you. This is the part garden centers leave off the plant tag. Citronella grass smells great on a windowsill, but a potted plant sitting still on a patio isn't emitting enough oil vapor to push mosquitoes out of the airspace around your ankles. The plants that get marketed hardest as "mosquito repellent plants" (citronella geranium, lemongrass, lavender, marigold, catnip, basil) are real sources of repellent compounds, but the effect only shows up when you actively process the plant: crush the leaves and rub them on skin, or extract the oil. The EPA registers several plant-derived oils as active ingredients in actual repellent products, most notably oil of lemon eucalyptus (OLE, the refined form is registered as PMD). That distinction matters a lot: a bottle of EPA-registered repellent with 30% OLE has gone through efficacy testing. A lemon eucalyptus tree in your side yard has not, and won't behave the same way. [1]
What plants repel mosquitoes, and how well do they actually work?
| Citronella grass | Citronellal, geraniol | 20 min to 2 hrs protection [3] | Minimal, oil not released in useful amounts | |
|---|---|---|---|---|
| Catnip | Nepetalactone | Strong repellency in lab trials [2] | Unstudied at ambient garden levels | |
| Lemon eucalyptus (refined, PMD) | PMD | Comparable to low-concentration DEET, EPA-registered [1] | Not applicable; raw plant oil is not the registered form | |
| Lavender | Linalool | Some repellency to certain mosquito species in lab tests | Mild, localized to crushed foliage | |
| Marigold | Pyrethrum-related compounds, thiophenes | Limited human studies | Anecdotal only | |
| Basil, rosemary | Various terpenes | Weak repellency shown in some lab assays | Minimal | Bottom line on plants: they're a nice-to-have, not a control strategy. If you want real numbers from a real study, look up the specific oil, not the plant name. For read more on what's actually in registered products, see our natural mosquito repellent guide. |
The plants most commonly cited are citronella grass (Cymbopogon nardus), lemongrass, lavender, catnip (Nepeta cataria), marigolds, basil, rosemary, and lemon eucalyptus (Corymbia citriodora). Each contains some combination of the oils mosquitoes find irritating or confusing to their odor receptors. The strongest research result in this group is on catnip oil. A study published in the Journal of Medical Entomology found nepetalactone, the compound in catnip, repelled mosquitoes effectively in lab bioassays, in some trials outperforming DEET at equal concentrations. That result is about extracted catnip oil applied at a controlled dose, not a catnip plant sitting in a garden bed. [2] Citronella oil has decades of use in candles and topical products. A Cochrane-style review and multiple field trials summarized by the CDC and university extension programs found citronella-based topical repellents give roughly 20 minutes to 2 hours of protection, much shorter than DEET or picaridin formulations, which run 4 to 8+ hours depending on concentration. [3] [4] Here's a rough comparison of what the research supports for oils extracted from these plants, applied as topical products, versus just having the plant growing nearby: | Plant / oil | Active compound | Effect as topical oil | Effect as growing plant |
Can I use mosquito repellent plants instead of an actual repellent?
No, not if you're actually trying to avoid bites, and especially not if you live somewhere with mosquito-borne disease risk. Growing citronella or lavender in pots around a patio might contribute a faint background scent, but it won't come close to a registered repellent's tested efficacy. The CDC's guidance on preventing mosquito bites recommends EPA-registered repellents containing DEET, picaridin, IR3535, oil of lemon eucalyptus (OLE), para-menthane-diol (PMD), or 2-undecanone. Notably, CDC does not include "grow citronella plants" or "plant marigolds" as one of its recommended prevention steps. [3] Where plants can genuinely help is as one layer among several: a bit of scent masking near seating areas, plus screens, plus fans (mosquitoes are weak fliers and struggle in even light breeze), plus a topical repellent when you're actually outside at dusk. Treat the plants as ambiance, not defense.
How do you get rid of mosquitoes in your backyard?
Getting rid of mosquitoes in a yard starts with water, not plants or sprays. Mosquitoes need standing water to complete their life cycle, and a female mosquito can lay 100 to 300 eggs at a time in water as shallow as a bottle cap. Eliminating or treating standing water is the single highest-leverage step. [5] Walk your property every week during mosquito season and dump, drain, or cover anything holding water: clogged gutters, saucers under potted plants, tarps, old tires, birdbaths that sit stagnant for more than a few days, and low spots in the yard that pool after rain. For water you can't drain (ornamental ponds, rain barrels), the EPA-registered larvicide Bti (Bacillus thuringiensis israelensis) kills mosquito larvae without significant toxicity to fish, birds, or mammals when used per label directions. Dunks and pellets containing Bti are sold at most hardware stores. [6] Beyond source reduction, a barrier treatment (a residual insecticide sprayed on vegetation, fence lines, and shaded resting spots) knocks down the adult population that's already flying around your yard. These treatments don't eliminate mosquitoes; they reduce numbers for roughly 10 to 21 days depending on product, weather, and rainfall, which is why most pest control companies, including us at Duskproof, run them on a repeat cycle through the season rather than as a one-time spray. If you want a professional look at your specific yard, a free yard assessment will tell you where mosquitoes are breeding and resting on your property, more than guess from a product label. For a full rundown of methods and how they compare, see mosquito control.
How do you keep mosquitoes away for good?
There's no "for good." Mosquitoes are established insects with huge regional populations, and no yard treatment, plant, or gadget eliminates them permanently. What actually works is layering several partial measures so the combined effect is a much quieter yard. The layers, roughly in order of impact: remove standing water weekly, keep grass and brush trimmed short (adult mosquitoes rest in shade and tall vegetation during the day), run a barrier treatment or misting system on a schedule through the season, use fans on patios and decks (mosquitoes fly poorly above about 1 mph of airflow), and apply a topical EPA-registered repellent to skin when you're actually going to be outside at dawn or dusk, the peak activity window for Culex and Aedes species. [3] Misting systems, which release a fine insecticide mist on a timer from nozzles installed around a property, add a layer of automation but need refilling and periodic maintenance, and they still rely on an EPA-registered active ingredient applied per label, same as a barrier spray. Neither approach is "safe" in the sense of harmless; both are effective when applied correctly and responsibly by label directions.
How do you get rid of mosquitoes in the house?
Indoor mosquitoes usually come in through open doors, torn screens, or gaps around windows, and a few can also emerge from small containers of standing water indoors (a forgotten vase, a plant saucer, even a floor drain). Start by finding the entry point, more than swatting the mosquito you see. Check window and door screens for holes; a gap the size of a pencil eraser is enough for a mosquito to get through. Dump any standing water in trays, vases, or humidifier reservoirs that's been sitting more than a few days. Indoor traps that use UV light and a fan (not the bug zappers with electric grids, which mostly kill non-biting insects) can reduce numbers over a few days. A registered indoor aerosol labeled for flying insects handles the immediate problem; look for pyrethrin or pyrethroid active ingredients on the label and follow ventilation instructions exactly. If mosquitoes keep reappearing indoors despite sealed screens, the likely source is outside your door, meaning a yard-level breeding or resting problem is feeding the house. That points back to source reduction and, if the problem persists, a professional look at the property.
How do you get rid of ticks in the yard?
Tick control in a yard depends heavily on managing habitat, more than spraying. Ticks don't jump or fly; they climb to the tips of grass and low brush and wait (a behavior called "questing") for a host to walk by, so the highest tick densities show up at the lawn edge, in leaf litter, and in tall grass and brush. The CDC and university extension programs recommend the same core steps: keep grass mowed short, remove leaf litter and brush, create a 3-foot-wide barrier of wood chips or gravel between lawn and wooded areas to restrict tick migration, and keep play equipment and seating away from yard edges. This tick-safe landscaping approach can measurably reduce the number of ticks encountered in high-use areas. Barrier and perimeter pesticide treatments targeting tick habitat (acaricide sprays applied to the yard edge and vegetation, timed to nymph and adult activity peaks) are also part of many integrated tick management programs and have shown meaningful reductions in tick abundance in field studies, though results vary by region, tick species, and application timing. [7] For pets and people, check for ticks daily during tick season, especially after time in leaf litter or tall grass, and shower within two hours of coming indoors, which studies suggest may reduce the risk of tick-borne illness. See tick repellent for what to put on skin and clothing, separate from yard-level treatment.
When do mosquitoes go away for the season?
Mosquitoes typically become inactive once nighttime temperatures drop consistently below about 50°F, since most species stop flying and feeding below that threshold, though the exact date varies enormously by region and by species. In much of the northern US, that means late October through November; in the Gulf Coast, Florida, and southern California, some species stay active close to year-round in mild winters. Cold doesn't kill the population outright, either. Many mosquito species overwinter as eggs (laid in a location that will flood in spring) or as adult females that find a sheltered spot (culverts, tree holes, crawl spaces) and go dormant until temperatures rise again. That's why a yard that seemed mosquito-free in January can be active again within weeks of the first warm, wet spring days. Because the season's start and end dates shift year to year with weather patterns, check your local mosquito control district or state health department for the specific activity window in your area rather than relying on a fixed calendar date. If you want to know more about mosquito biology generally, our mosquito page covers life cycle and species differences in more depth.
Do citronella candles and tiki torches actually work?
They provide a modest, localized effect, mostly by adding smoke and a light citronella scent to the air right around the flame, not by repelling mosquitoes across a patio. Field studies on citronella candles generally find they reduce landing rates somewhat within a couple feet of the candle but don't create a meaningful protective zone beyond that. If you're hosting people at a table, a citronella candle in the center does close to nothing for the person at the far end. Combine it with a fan (genuinely effective, since mosquitoes are weak fliers) and it becomes more useful as part of a layered approach rather than a standalone fix.
Are mosquito repellent plants safe around kids and pets?
Most of the plants marketed as mosquito repellent (citronella grass, lemongrass, lavender, marigold, basil) are not toxic in small amounts, but a few common "repellent" plants are genuinely dangerous if chewed by pets. Citronella geranium (Pelargonium citrosum) and lemongrass can cause vomiting or mild GI upset in dogs and cats if ingested in quantity, according to the ASPCA's toxic and non-toxic plant lists, so it's worth checking a specific plant against that list before adding it to a yard with pets or small kids who put things in their mouths. Essential oils extracted from these plants are a separate concern: concentrated citronella, lavender, or lemongrass oil applied undiluted to a pet's skin or ingested can cause more serious reactions than the whole plant would. If you're using a plant-based topical repellent on kids, check the label for pediatric use guidance; CDC recommends not using OLE or PMD-based repellents on children under 3 years old. [3]
What actually moves the needle in a mosquito-heavy yard?
If you're deciding where to put time and money, rank it this way: standing water removal first (free, and the highest-impact single action), then habitat management (mowing, clearing brush, trimming vegetation where mosquitoes and ticks rest), then a barrier treatment or misting system for the adult population that's already established, then personal repellent for the times you're actually outside. Mosquito repellent plants sit at the bottom of that list, a pleasant addition, not a plan. A barrier treatment applied on a 10 to 14 day cycle through mosquito season is the standard interval most pest control providers use, timed to the residual life of the insecticide and typical regrowth of vegetation between visits. It won't eliminate mosquitoes from your property (nothing does, short of draining every water source for miles), but it knocks the resting and biting population down significantly for the interval between treatments, which is the realistic goal. If you're trying to figure out whether your yard's problem is standing water, vegetation, or a neighborhood-wide population pushing in from nearby, a professional walk-through beats guessing. Get a free yard assessment and you'll get a specific read on your property instead of a generic checklist.
Frequently asked questions
What is a mosquito repellent plant?
It's a plant containing natural oils, like citronellal, geraniol, or linalool, that mosquitoes tend to avoid at high concentrations. The oil only matters when it's released or extracted (crushed onto skin, distilled into oil); a plant just growing in a pot releases too little vapor to repel mosquitoes across a yard.
What plants repel mosquitoes the best?
Catnip oil showed strong repellency in lab studies, in some trials rivaling DEET, according to research in the Journal of Medical Entomology. Citronella, lemongrass, lavender, and marigold contain repellent compounds too, but as growing plants they add only a faint effect, not measurable protection.
How do I get rid of mosquitoes fast?
Remove all standing water in your yard, treat water you can't drain with an EPA-registered Bti larvicide, and use fans on patios since mosquitoes fly poorly in light breeze. For an immediate knockdown of adults already present, a professional barrier spray works faster than any plant or DIY method.
How do I keep mosquitoes away from my patio?
Run a box fan or ceiling fan; mosquitoes struggle to fly against even light airflow. Add a barrier treatment or misting system for the season, remove standing water nearby, and use a topical EPA-registered repellent at dusk. Citronella candles help only within a couple feet of the flame.
How do I get rid of ticks in my yard?
Mow grass short, clear leaf litter and brush, and add a 3-foot barrier of wood chips or gravel between lawn and wooded edges, per CDC tick-safe landscaping guidance. Perimeter acaricide treatments targeting yard edges can further reduce tick numbers when timed to seasonal activity peaks.
How do I get rid of mosquitoes in my house?
Check screens for gaps, dump any indoor standing water (vases, trays, humidifier tanks), and use a UV-light fan trap or a registered indoor aerosol for flying insects. If mosquitoes keep coming back, the source is likely outside; treat the yard's standing water and resting vegetation too.
When do mosquitoes go away for the year?
Most species stop flying and feeding once nighttime temperatures consistently drop below about 50°F, typically late October to November in northern states, later or not at all in warm southern climates. Many species overwinter as eggs or dormant adults rather than dying off completely, so check your local health department for area-specific timing.
Do mosquito plants like citronella and lavender actually work?
Extracted oils from these plants show real, short-lived repellency (roughly 20 minutes to 2 hours per CDC-cited research) when applied topically at proper concentration. The living plants themselves release far less oil vapor and provide only a mild, localized effect, not yard-wide protection.
Can I plant a mosquito repellent garden instead of using spray?
You can plant one, but don't expect it to replace a repellent or treatment plan. CDC's mosquito bite prevention guidance recommends EPA-registered repellents (DEET, picaridin, OLE, IR3535) and does not list garden plants as a standalone prevention method.
Are citronella plants poisonous to dogs or cats?
Citronella geranium and lemongrass can cause mild vomiting or GI upset in pets if chewed in quantity, according to the ASPCA's plant toxicity lists. Concentrated essential oils are more concerning than the whole plant. Check a specific species against the ASPCA list before planting where pets graze.
How often should a mosquito barrier treatment be reapplied?
Most pest control providers, including barrier programs run on a 10 to 14 day cycle through mosquito season, timed to the insecticide's residual breakdown and new vegetation growth between visits. Rain and heat can shorten the effective window, so a provider may adjust timing based on your specific weather.
Do bug zappers get rid of mosquitoes?
Not effectively. Electric grid bug zappers mostly kill non-biting insects attracted to UV light; multiple field studies have found mosquitoes make up a small fraction of what they catch. Fan-based UV traps designed specifically for mosquitoes perform somewhat better indoors but aren't a full yard solution.
Sources
- EPA, Skin-Applied Repellent Ingredients: EPA registers oil of lemon eucalyptus (OLE/PMD) as an active repellent ingredient distinct from raw plant oil
- Journal of Medical Entomology, catnip repellency study: Nepetalactone from catnip showed strong mosquito repellency in lab bioassays, comparable to or exceeding DEET at equal concentration
- CDC, Mosquito Bite Prevention: CDC recommends EPA-registered repellent active ingredients for mosquito bite prevention
- University of Florida IFAS Extension, Mosquito Repellents: Citronella-based topical repellents provide shorter protection duration than DEET or picaridin formulations
- CDC, Preventing Ticks in the Yard: Tick-safe landscaping including short grass, leaf litter removal, and wood-chip barriers reduces tick encounters in yards
- CDC, Integrated Tick Management: Perimeter acaricide treatments targeting yard-edge habitat are part of effective integrated tick management programs
- ASPCA, Toxic and Non-Toxic Plant List: Certain mosquito repellent plants such as citronella geranium can cause GI upset in pets if ingested