Do Plants Repel Flies? Garden Herbs and Practical Fly Control

Dec 18, 2024by Juanita Schulze

During one Texas winter, the flies around our home were especially thick. They kept getting inside, which sent me looking for ways to make the house and porch less inviting to them. Like many gardeners, I was drawn to the idea of growing something attractive that might also help with a pest problem.

Lavender, basil, mint and other aromatic plants often appear on lists of fly repellents. They can be wonderful additions to a garden, but a pot of herbs beside the door should not be treated as a dependable fly barrier. For nuisance flies around the home, removing breeding material and keeping them outside are the more practical starting points.

Can Growing Plants Keep Flies Away?

There is an important difference between a living plant, a concentrated plant extract and a formulated insect-repellent product. A strong fragrance that people notice does not establish how well a plant will protect a doorway or patio.

Do not assume that research or label claims for a particular extract apply to a whole plant growing in a pot. Likewise, a product intended for mosquitoes is not automatically effective against house flies.

Grow aromatic herbs for their kitchen uses, fragrance and garden appeal. Treat any fly-deterring benefit as something not to rely on, rather than the reason your fly-control plan should work.

Start by Identifying the Fly

“Flies” covers many different insects. House flies around trash, tiny flies near ripening fruit and small flies emerging from potting mix may need very different solutions.

If the problem persists, note where the insects gather and where they may be developing. Your local Extension office can help with identification. Spraying a doorway will not solve a breeding source hidden elsewhere.

Herbs and Flowers Worth Growing

The plants below can earn a place in your garden without a promise that they will keep flies away.

Basil. Grow it for fresh leaves and everyday cooking. In our Texas garden, basil has done well through summer and continued nicely as temperatures eased. Give it suitable warmth, light, drainage and regular moisture.
Mint. I enjoy mint in iced tea, a Texas favorite. Keep it in a separate container if you do not want its spreading growth to take over nearby planting space.
Lavender. Its flowers and fragrance are appealing, but site and variety matter. I once grew six varieties in spring and lost them by summer. That experience is a reminder to consider heat, humidity and drainage, not simply buy a plant because it appears on a repellent list.
Lemongrass. Choose a culinary type if you want to use it in the kitchen, and allow room for its clumping growth. Its citrus scent does not turn the living plant into a reliable fly-control product.
Marigolds and nasturtiums. Enjoy them for color and garden interest. Do not expect a window box or border to provide general protection from flies or every other garden pest.

Place containers where the plants' light and watering needs can be met. A shaded doorway is not necessarily a good growing location just because it is where the flies enter. Avoid obstructing screens, door closure or access.

Remove What Attracts and Breeds Flies

Many nuisance flies develop in moist, decaying organic material. The most useful work often happens around trash, pet areas and food waste rather than in the herb bed.

Manage garbage promptly. Use tight-fitting lids, remove waste regularly and clean residues from containers.
Pick up animal waste. Do not let it accumulate near doors or outdoor eating areas.
Clear food scraps and spills. Clean tables, cooking areas and recycling containers rather than leaving sugary or greasy residues behind.
Collect fallen and overripe fruit. Remove decaying produce from the garden and check indoor fruit bowls when small flies appear.
Manage compost thoughtfully. Keep kitchen collection containers covered and avoid leaving exposed food scraps where flies can use them.

Sanitation does not mean removing every insect or every bit of organic matter from a healthy garden. Focus on the material supporting the particular nuisance fly you are dealing with.

Use Screens and Close Entry Gaps

Repair torn window and door screens, check that screen doors close properly and address gaps around entry points. Keep unscreened doors closed when practical, especially while carrying food in and out.

Cover food during outdoor meals. For a few flies already indoors, a flyswatter may be enough. If using sticky flypaper, follow its directions and keep it out of reach of children and pets.

University of California Integrated Pest Management guidance emphasizes sanitation and screens as the foundation of household fly management. Read its fly-management guide for more detail.

Skip Homemade Essential-Oil Sprays

Natural does not automatically mean harmless. Essential oils are concentrated substances, and some can irritate skin or cause poisoning when misused. A homemade mixture of water, dish soap and essential oils has no dependable directions for concentration, exposure or safe use around people, animals and food surfaces.

I do not recommend using that homemade spray or leaving oil-soaked cotton balls around as a general fly-control method. Do not assume diffusing an oil will safely or reliably control indoor flies.

Pennyroyal oil deserves particular caution: Poison Control warns that it is highly toxic and should never be used as an insect repellent. It is not a suitable DIY remedy.

If a pest-control product is needed, choose one labeled for the specific pest and intended location, and follow every direction. Do not apply general essential oils to skin, pets, edible plants or food-contact surfaces as an improvised treatment. Consult a qualified pest professional if the source cannot be found or the infestation continues.

A More Useful Plan for Your Porch and Garden

Identify the problem. Learn which fly you are seeing and where it develops.
Remove breeding sources. Start with waste, spills, decaying produce and other suitable material.
Check the barriers. Repair screens and improve door closure.
Grow plants you genuinely enjoy. Choose herbs and flowers suited to your climate and available light.
Reassess if flies persist. Look for a missed source and seek identification or professional help instead of adding more pots or stronger homemade mixtures.

A fragrant herb garden can make a porch more enjoyable and put fresh ingredients close to the kitchen. Let the plants do what they do well, while sanitation and good screens do the main work of keeping nuisance flies out.