With summer temperatures soaring across the country, "Flying Ant Day" is arriving earlier than usual this July. If you’ve stepped outside today, you’ve likely already seen the sudden, chaotic swarms of winged ants taking to the air.
While these annual mating swarms are entirely harmless to humans, they can easily ruin a backyard afternoon or find their way into your home.
But before you reach for expensive, harsh chemical sprays, take a look in your spice rack. A simple jar of ground cinnamon is actually a dual-action yard superhero, as tackles it both the ant invasion and keeps any soil fungus issues at bay.
Here is why this kitchen staple works so well, and the best way to apply it.
The ant shield: disrupting the scent trails
Tabloid articles love to claim that cinnamon works because ants "inhale the powder and suffocate." In reality, the science is much more straightforward, and a lot less dramatic.
Cinnamon doesn't impact an ant's respiratory system at all. Instead, it acts as a powerful topical irritant and an olfactory deterrent. It all comes down to a natural compound called cinnamaldehyde, which gives the spice its signature pungent aroma.
Because ants rely almost entirely on highly sensitive scent receptors to navigate and follow pheromone trails, the overpowering smell of cinnamon effectively scrambles their tracking. It doesn't kill the colony, but it completely masks their pathways, forcing the swarm to look elsewhere.
My strategy for applying it
- The thresholds: I dust a line of ground cinnamon along exterior door steps and window sills to create an immediate olfactory boundary they won't want to cross.
- The entry points: Look for pavement gaps or cracks in brickwork where you can see flying ants actively emerging from their underground nests, and dust the opening directly.
- The entertaining zones: If you want to keep them away from your garden furniture, sprinkling cinnamon around patio dining areas, outdoor table legs and plant pots is a brilliant, chemical-free way to protect your space.
A standard jar of supermarket ground cinnamon works brilliantly for a quick, immediate fix around the garden. However, if you find the outdoor breeze is blowing the powder away, you can also try cinnamon essential oil diluted with a bit of water in a spray bottle for a more rain-resistant barrier.
Just remember that whether you use the kitchen powder or the oil, the potent aroma will naturally fade after a few days in the summer heat, so be ready to reapply it to keep your defense line strong.
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