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Asked: October 7, 20202020-10-07T17:56:55+00:00 2020-10-07T17:56:55+00:00In: Garden

Are Plants that Repel Mosquitoes a Scam?

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Are Plants that Repel Mosquitoes a Scam?

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      2020-10-07T18:11:45+00:00Added an answer on October 7, 2020 at 6:11 pm

      ARE PLANTS THAT REPEL MOSQUITOES A SCAM?

      PLANTS THAT CONTAIN CITRONELLA, AND WHY YOU NEED TO BUY INSECT REPELLENT

      I’m going to be straight with you. You cannot run over to your local garden centre or hop online and purchase a plant (or thirty) that will make your summer backyard gatherings mosquito-free.
      Vertical image of a mosquito on a green leaf, with green and white text in the top third and at the bottom of the frame.

      It’s just not going to happen.

      You’ve probably heard of any number of plants that have mosquito-repelling properties. These might include:

      • Allspice
      • Artemisia
      • Basil
      • Cajeput
      • Catmint
      • Catnip
      • Cedar
      • Chives
      • Cinnamon
      • Citronella Grass
      • Garlic
      • Geranium
      • Lemon Balm
      • Lime basil
      • Marigold
      • Mint
      • Pennyroyal
      • Pine
      • Rosemary
      • Tarragon
      • Verbena

      The thing is, with all these plants, you have to crush or burn some part of the plant to get to the substance within that offers the repellant properties. Simply plopping it in a pot on your back patio will not the problem solve.

      Horizontal image of blooming lavender, fading into soft focus in the background.
      Lavender’s lovely, but not likely a quick fix.
      That’s not to say you shouldn’t grow these beauties in your garden! But just don’t expect a mosquito-free backyard picnic just because you planted some lavender.

      Vertical image of pink pennyroyal flowers with green foliage.
      Pennyroyal is rumoured to double as a mosquito repellent.
      Many of these plants contain the substance citronellal, which does indeed have insect-repellent properties. But they don’t spew it into the air, chasing away mosquitoes, no matter how much we’d like them to.
      Closeup image of a mosquito on a hand, with a gray background.
      To get a better picture of the plant kingdom’s contribution to mosquito deterrence, let’s look more closely at some of these lovely plants.

      THE FAKE CITRONELLA PLANT

      You might come across, at big-box stores, in particular, plants marketed as “citronella plant” or “mosquito plant.” If it’s a lacy-leafed thing that looks like a geranium, it’s probably Pelargonium ‘citrosum,’ or P. ‘citrosum Van Leenii’ a geranium with fragrant leaves that smell like citronella.

      It was once said that this plant was the result of combining genes of two other plants – citronella grass and African geranium. But that claim has since been debunked; it’s simply a variety of geranium.

      Closeup of a feathery green scented geranium leaf.
      Scented Geranium Plants in 4-Inch Pots

      P. ‘citrosum’ contains less than 1 per cent of citronellal, the compound that has the insect-repelling properties.

      It’s a pretty plant, and it smells good, so if you’d like to add one to your landscape, please do; you can get a live, 4-inch plant from Burpee. But don’t expect it to banish the bugs.

      THE REAL CITRONELLA PLANT

      Let’s look at the grass-like plants that boast a higher concentration of citronellal.

      Ceylon citronella grass (Cymbopogon nardus), available via Amazon, and Java citronella grass (C. winterianus) are related to a plant well-known in southeast Asian cooking – lemongrass (C. citrate), available from True Leaf Market.

      Citronella Grass, 6 Live Plants

      These are clump-forming grasses that are perennial in zones 10-12, but grow as annuals in other zones.
      Pale green lemon grass.
      Heirloom Lemon Grass Seeds

      C. nardus contains an average of 14% citronellal, while C. winterianus has about 22% citronellal. These are the plants that supply the oil used in commercial citronella products, such as candles.

      MORE CITRONELLA IN SOUTH AMERICA

      Another citronellal-containing plant for which limited information is available in English is Citronella mucronata, also known as Chilean citronella or, in Spanish, huillipatagua.

      Citronella mucronata leaves with sun shining through, shot from underneath.
      C. mucronata. By pabloendemico. D. Don, CC via Wikimedia Commons Attribution 2.0 Generic License.
      Chilean citronella is an evergreen tree native to Chile that can grow to be 30 feet tall. It is one of approximately 25-30 plants in the Citronella genus, most of which are native to tropical climates.

      We couldn’t find much information about their citronellal content, but it’s no matter since you’re unlikely to find these plants for sale in North America.

      ANOTHER OPTION: LEMON BALM

      A citronellal-containing plant you might consider for your back porch is lemon balm (Melissa officinalis), which is said to have as much as 38% of the substance.
      Green lemon balm leaves.
      Lemon Balm Seeds

      Packets of 700 seeds are available from Burpee.

      Lemon balm is a herbaceous perennial native to south-central Europe, the Mediterranean Basin, Iran, and Central Asia. A member of the mint family, it is often used to make teas to relieve indigestion and promote relaxation.

      OR, JUST BUY A SPRAY

      So, having told you about all these plants, the fundamental fact still remains: simply planting these in your landscape will do absolutely nothing to chase away the bothersome bugs.
      Closely cropped image of a woman's torso, clothed in a pink tank top with bare arms, spraying a bottle of orange insect repellent onto her skin.
      You would have to crush the leaves or stalks of these plants and rub them on your skin. This, of course, can be risky because of potential skin sensitivities. If you really want to try this, do a “patch test” first – apply to a small area of skin and make sure you don’t react badly.

      If you have a football field of a backyard, I suppose you could plant a whole lot of, say, C. winterianus, and build a pressing/extracting plant and a bottling plant…

      Sky Organics Organic Bug Spray, 4 Oz.

      More logical, perhaps, is to purchase a spray-on product containing citronella (the candles don’t work terribly well). This one from Sky Organics, available from Amazon, contains several plant-based oils.

      However, the most certain way to repel these unwelcome pests is with a spray containing DEET, such as this one from Repel via Amazon. This chemical has been found to be the very best mosquito repellent. If DEET’s not your thing, use the natural, citronella-containing stuff, but apply it often as it evaporates fairly quickly.

      Repel 100 Insect Repellent, 4 Oz.

      Also, reduce populations of mosquitoes by eliminating their breeding grounds: standing water. Be diligent, especially after a rainfall, about walking the yard and emptying out buckets and whatnot that may have collected water.

      PRETTY, BUT INEFFECTIVE

      While all these wonderful plants have many things to offer to your landscape, getting rid of mosquitoes is not among them. From a practical standpoint, anyway.

      Four purple martins on a white house constructed to house them, against a blue sky.
      Purple martins can help to solve your pest problems.
      Eliminate standing water, purchase a spray containing either citronella or DEET, and enjoy a misery-free summer! You might also want to attract purple martins to your yard, as these birds enjoy a mosquito snack now and then.

      What’s your favourite way to eliminate mosquitoes from your yard? Share in the comments section, below!

      And for more on ridding your landscape of common garden pests, check out the following: READ MORE

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