Several dozen plants produce volatile compounds that mosquitoes find irritating or confusing, and growing them strategically can make your outdoor spaces less inviting to biting insects. But there’s an important caveat to understand before you start planting: a living plant sitting quietly in a pot is not the same as a concentrated repellent. The strongest evidence for mosquito-repelling activity comes from extracted essential oils and isolated compounds, not from whole plants growing in the ground. These plants work best when you actively release their oils by crushing leaves, brushing against foliage, or burning stems.
With that in mind, here are 25 plants with genuine mosquito-deterring properties, how they work, and how to get the most out of them.
The Powerhouses: Strongest Evidence
Lemon eucalyptus is the gold standard among plant-based repellents. Its leaves are rich in citronellal, and the distillation process produces a compound called PMD (para-menthane-3,8-diol), the only plant-derived active ingredient recommended by the CDC for mosquito protection. Commercial repellents with 30 to 40 percent oil of lemon eucalyptus provide roughly two hours of protection per application.
Citronella grass is the source of citronella oil, probably the most recognized natural repellent in the world. The oil is high in both citronellal and geraniol, two compounds that interfere with a mosquito’s ability to locate you. Citronella candles and torches use this oil, though they work best in still air where the scent stays concentrated. The living plant is a tall, clumping grass that thrives in warm climates and containers.
Catnip deserves far more attention than it gets. Research from Iowa State University found that the active compound in catnip, nepetalactone, is a significantly better spatial repellent than DEET. In laboratory testing, catnip oil repelled roughly 50 percent of yellow fever mosquitoes at concentrations where DEET showed only 10 percent repellency. The key distinction: catnip excels at keeping mosquitoes away from an area (spatial repellency), while DEET works better when applied directly to skin (contact repellency). Catnip is easy to grow, almost aggressively so, and crushing a few leaves near your seating area releases the oils effectively.
Herbs You Probably Already Grow
Lavender produces linalool, a floral compound that mosquitoes avoid. Plant it along walkways where you’ll brush against it regularly, releasing the scent as you pass. It thrives in dry, sunny spots and needs minimal water once established.
Basil is one of the few plants that emits its aromatic compounds without being crushed, making it more passively useful than many others on this list. Sweet basil, lemon basil, and cinnamon basil all contain mosquito-deterring volatiles. Keep pots near your outdoor dining area and pinch leaves while you cook.
Rosemary releases a piney, resinous scent that mosquitoes dislike. It’s especially effective when burned. Toss a few sprigs into a fire pit or onto grill coals to create mosquito-repelling smoke that also smells wonderful. As a living plant, rosemary does well in containers and tolerates heat and drought.
Peppermint contains high levels of menthol, which is irritating to mosquitoes. It spreads aggressively in garden beds, so containers are the better choice. Crush leaves and rub them on exposed skin for short-term, mild protection. Spearmint works similarly and has a slightly sweeter scent.
Thyme, particularly lemon thyme, contains thymol, a compound with documented insect-repelling properties. Crushing the tiny leaves between your fingers releases enough oil to provide some local deterrence. Oregano is a close relative with overlapping chemistry and similar effects.
Sage is best used as a burning herb. Adding dried sage to a fire pit or campfire produces aromatic smoke that helps clear mosquitoes from the immediate area. Common garden sage and white sage both work.
Lemon balm is a mint-family plant with a strong citrus scent that contains citronellal, the same compound found in citronella grass and lemon eucalyptus. It grows easily (sometimes too easily) and does well in partial shade.
Fragrant Flowers and Ornamentals
Scented geraniums, especially the citronella-scented variety sometimes sold as “mosquito plants,” contain geraniol. These are not true citronella plants, but the lemon-rose fragrance of their leaves does have repellent properties when released. Crush a leaf or two and place them on the table during outdoor meals.
Marigolds contain pyrethrum, a compound used in commercial insecticides. French marigolds are the most potent variety. They also repel aphids and whiteflies, making them useful companion plants in vegetable gardens. Their pungent scent is strongest on warm days.
Chrysanthemums are the original source of pyrethrin, one of the most widely used natural insecticides in the world. The compound is concentrated in the flower heads. Growing them around patios adds some deterrence, though the extracted compound is far more powerful than the living plant.
Lantana produces a complex mix of volatile compounds from its leaves and flowers. Some research has shown lantana extracts can reduce mosquito landing rates. It’s a vigorous grower in warm climates and blooms continuously through summer. Be aware it’s considered invasive in some regions.
Bee balm (also called wild bergamot) attracts pollinators while its crushed leaves release compounds mosquitoes avoid. Pennyroyal is another mint-family flower with strong repellent properties, though it should never be ingested, as it’s toxic to humans and pets in concentrated form.
Aromatic Grasses and Tropical Plants
Lemongrass is closely related to citronella grass and contains many of the same active compounds, including citral and geraniol. It’s widely used in Southeast Asian cooking, so planting it near a sunny seating area lets you harvest for the kitchen while benefiting from the scent. It grows as a perennial in warm climates and an annual in cooler zones.
Vetiver grass produces a dense, earthy oil from its roots that has shown mosquito-repelling activity. It’s also excellent for erosion control and grows in thick clumps that can serve as a border planting.
Eucalyptus varieties beyond lemon eucalyptus also contain eucalyptol, a compound with insect-repelling properties. In warmer climates, a potted eucalyptus on the patio adds both fragrance and some mosquito deterrence. In cooler areas, dried eucalyptus branches placed near seating areas release scent passively.
Less Common but Worth Growing
Wormwood (the plant used to make absinthe) contains absinthe oil, which has documented insect-repelling properties. Its silvery foliage looks striking in garden borders. Tansy is a related plant with similar chemistry and bright yellow button flowers, though like pennyroyal, it’s toxic if ingested.
Pitcher plants and Venus flytraps take a different approach entirely. Rather than repelling mosquitoes, they trap and consume them. Pitcher plants are surprisingly effective at catching mosquitoes attracted to the standing water in their tube-shaped leaves. They won’t clear your yard, but they do reduce the local population over time.
Allium (ornamental garlic family) plants release sulfur compounds that many insects find unpleasant. Giant alliums make dramatic garden focal points while contributing mild insect deterrence in the surrounding area.
How to Actually Make These Plants Work
Simply placing a few pots around your patio will add beauty and fragrance, but it won’t create a mosquito-proof barrier. The aromatic compounds responsible for repelling mosquitoes are locked inside the plant’s leaves and stems until they’re physically released. A plant sitting quietly across the yard contributes almost nothing to mosquito control.
To get real benefit, you need to actively engage with the plants. Crush a few leaves and rub them on your skin for mild, short-term protection. Place crushed foliage in small dishes on your outdoor table. Burn rosemary or sage sprigs in a fire pit, letting the smoke carry repellent compounds through the air. Plant lavender and lemongrass along paths where foot traffic will naturally brush the foliage. Grow basil and mint in containers you can move right next to your chair.
Dense plantings near high-use areas work better than scattered individual pots. The goal is to concentrate the fragrance in the zone where you’re sitting, not to perfume the entire yard. Containers are ideal because you can reposition them based on where you’re spending time.
What Plant-Based Repellents Can’t Do
No garden plant, no matter how densely planted, replaces a properly formulated repellent when mosquito-borne diseases are a concern. It’s worth noting that garlic oil, rosemary, lemongrass, thyme, and geraniol oils have no EPA-registered repellent products, meaning they haven’t met the threshold for proven protection duration and reliability. Oil of lemon eucalyptus is the one plant-derived ingredient with EPA registration, and even it provides only about two hours of protection per application compared to longer-lasting synthetic options.
The best approach combines multiple strategies. Grow these plants for enjoyment and supplemental deterrence. Eliminate standing water where mosquitoes breed. Use fans on porches (mosquitoes are weak fliers). And when you’re in a high-risk area or during peak mosquito season, reach for a tested repellent product alongside your garden herbs.