On a hot summer’s day, the last thing I want on my patio is a trail of ants – and, thanks to this one plant, it’s the very last thing I’ll get. This plant has a fabulously fresh fragrance that I adore but ants absolutely hate, so while the patio bathes in its glorious scent all summer, those pesky garden pests stay away. The tiny lilac flowers are pretty, too. I spotted the ‘Keep Ants Away’ sign next to a small pot of European pennyroyal ( Mentha pulegium ) at a flower show last summer. My patio was then overrun with ants – my perpetually crumb-dropping kids were entirely to blame for the invasion – so of course I had to give it a try. Because I like to garden organically, I appreciate that this natural pest control method wouldn’t involve using chemicals that might harm the wildlife in my backyard. And hey presto, it actually worked to get rid of ants on the paving! I’m pretty sure my pennyroyal plant is also working as a more general insect repellent, too, because I’ve noticed far fewer mosquitoes around the patio. My hunch may well be right because its name hints of historical use as a pest repellent as ‘pulex’ translates to ‘flea’. This isn’t just anecdotal; several studies have demonstrated the efficacy of certain plants in deterring ant colonies. Let’s delve into seven of the most effective plants that can naturally keep ants away from your outdoor space, providing a fragrant and eco-friendly solution to this common problem.
1. European Pennyroyal (Mentha pulegium): The Original Ant Repellent
Let’s start with the plant that initially inspired this entire endeavor: European pennyroyal. As I discovered, this perennial mint is a powerhouse when it comes to repelling ants. Its potent scent, similar to menthol and eucalyptus, is utterly repulsive to these tiny invaders. What’s fascinating is that the effectiveness stems from a compound called pulegone, which is concentrated far more in European pennyroyal than in its American cousin, Hedeoma pulegoides. This difference is crucial – while both contain pulegone and offer some ant-repelling properties, the European variety provides a significantly stronger defense. Historically, pennyroyal was used in various ways to combat pests, from stuffing it into shoes to ward off fleas to incorporating it into herbal remedies. It thrives in containers due to its spreading nature and prefers moist conditions and full sun or partial shade. Interestingly, the plant’s rapid growth – it can spread up to two feet in a larger pot – is actually a benefit, creating a natural barrier around your patio. It’s a perennial, so you only need to plant it once for years of protection, making it a particularly rewarding addition to your garden. You can find European pennyroyal seeds at the Seed Needs Store via Amazon, though they are a little harder to get hold of than other varieties.
2. Lavender Varieties – Especially ‘SuperBlue’
Lavender, particularly varieties like ‘SuperBlue’, is another fantastic choice for keeping ants away. The strong, floral scent of lavender is a natural deterrent, and ants actively avoid it. Lavandula angustifolia ‘SuperBlue’ is a particularly robust and fragrant cultivar known for its vibrant purple flowers and impressive pest-repelling abilities. Studies have shown that lavender oil, derived from the plant, possesses significant insecticidal properties. While not as intensely potent as pennyroyal, lavender’s subtle yet persistent fragrance creates a welcoming environment for humans while actively discouraging ants from settling in. Planting lavender along the edges of your patio or in containers near your seating area is a beautiful and effective way to create a pest-free zone. The ‘SuperBlue’ variety is particularly well-suited to container gardening, offering a stunning display of color and a strong defense against unwanted guests. It’s a relatively low-maintenance plant, thriving in full sun and well-drained soil. A truly lovely and effective option.
3. French Marigold ‘Court Jester’ Seeds
Don’t overlook the humble French marigold, specifically the ‘Court Jester’ variety. These cheerful flowers aren’t just aesthetically pleasing; their seeds also emit a scent that ants find incredibly unpleasant. The seeds themselves contain natural compounds that disrupt the ants’ ability to navigate and communicate, effectively disrupting their colony’s activities. Planting French marigold seeds is a simple and inexpensive way to add a layer of protection to your patio. They’re relatively easy to grow and thrive in sunny locations, offering a splash of color and a potent deterrent against ants. The ‘Court Jester’ variety is particularly popular for its bright orange and yellow blooms, creating a visually appealing and functionally effective barrier. It’s a great option for beginners and adds a touch of rustic charm to any outdoor space. The seeds can be purchased from a variety of online retailers, including Amazon.
4. Bay Laurel Leaves: A Time-Honored Remedy
Bay laurel leaves have a surprisingly long history of use as an insect deterrent. Ancient civilizations, including the Greeks and Romans, utilized bay leaves to protect their homes and gardens from pests. The strong, aromatic oils within the leaves are believed to disrupt the ants’ sensory systems, making the area unattractive to them. Simply placing a few bay laurel leaves around your patio – perhaps tucked under pots or scattered along pathways – can be an effective, low-cost method of ant control. The leaves gradually release their scent, providing ongoing protection. Bay laurel trees are relatively easy to grow, though they require a sunny location and well-drained soil. If you have space, planting a small bay laurel tree can provide both shade and a natural ant repellent. Dried bay leaves are also readily available at most grocery stores and health food stores – making them a convenient and affordable option for patio protection.
5. Rosemary – For a Fragrant Defense
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Rosemary, with its invigorating scent and woody texture, is another plant that ants actively avoid. Like lavender, rosemary’s aroma contains compounds that interfere with the ants’ ability to navigate and communicate. Plant rosemary in containers along the edges of your patio or near entry points to create a fragrant barrier. Rosemary thrives in full sun and well-drained soil, making it a relatively low-maintenance addition to your garden. The plant’s silvery-green foliage provides a beautiful contrast to the surrounding landscape, and its potent scent adds a touch of Mediterranean charm to your outdoor space. It is also a fragrant herb that can be used in cooking, adding an extra benefit to its inclusion in your patio garden. Rosemary is a perennial, so you only need to plant it once for years of protection.
6. Mint (Beyond European Pennyroyal) – A Broad Spectrum Repellent
While European pennyroyal is a standout, other mint varieties also possess ant-repelling properties. Peppermint, spearmint, and even chocolate mint can be effective in deterring ants. The key is the strong, pungent aroma – ants simply don’t like it! Growing a selection of mint varieties in containers allows you to create a diverse and resilient defense against ants. Mint thrives in moist conditions and prefers partial shade, making it a versatile choice for various patio settings. Similar to pennyroyal, mint’s spreading nature can be beneficial, creating a natural barrier around your seating area. However, be mindful of mint’s tendency to spread aggressively, and consider containing it in pots to prevent it from overtaking other plants. This offers a wider range of scents that can confuse and deter ants effectively. The selection of mint varieties available is vast, allowing you to choose those with fragrances you enjoy as well as their ant-repelling capabilities.
7. Chamomile – A Delicate Defense
Chamomile, often associated with its calming properties, also possesses an unexpected defense against ants. The plant’s delicate, daisy-like flowers release a volatile oil that ants find irritating, causing them to avoid the area. Planting chamomile around the perimeter of your patio or in containers near entry points can provide a subtle yet effective barrier. Chamomile thrives in full sun and well-drained soil, and it’s an incredibly low-maintenance plant. Its cheerful white and yellow flowers add a touch of elegance to any outdoor space. While chamomile’s ant-repelling properties might not be as potent as those of pennyroyal or lavender, it’s a gentle and aesthetically pleasing option for those seeking a natural pest control solution. It’s often used in teas and herbal remedies, adding another layer of appeal to this versatile plant. We’ve found that even a small patch of chamomile can significantly reduce the number of ants on a patio – a testament to the power of nature’s defenses.
In conclusion, creating an ant-free patio doesn’t require harsh chemicals. By incorporating these seven plants – European pennyroyal, lavender, French marigolds, bay laurel leaves, rosemary, mint, and chamomile – you can create a fragrant and naturally protected outdoor space. Remember to consider your local climate and soil conditions when selecting plants, and don’t be afraid to experiment to find the best combination for your patio. Enjoy your ant-free oasis!
