Cinnamon Kills Ants: How to Use It

Cinnamon is a natural, non-toxic way to deter ants from entering your home. The strong scent of cinnamon (both ground and stick) disrupts the ants’ scent trails, making it hard for them to navigate and communicate. While it may not kill every ant on contact, it can kill ants that ingest it, and it works as a powerful repellent to keep them out of your kitchen and pantry.

Ingredients

1 tablespoon (7 g) ground cinnamon (for a powder barrier)
1 cup (240 ml) water (for a spray solution)
5-10 drops cinnamon essential oil (optional, for a stronger spray)
10-15 whole cinnamon sticks (for placing along baseboards and windowsills)

Instructions

Identify the ant trails. Look for lines of ants moving along baseboards, countertops, or windowsills. Wipe the area with soapy water to remove the existing scent trail.
Create a cinnamon powder barrier. Sprinkle a thin, continuous line of ground cinnamon (about 1/4 inch wide) across the ants’ entry points: door thresholds, window cracks, and along the edges of baseboards. Reapply after vacuuming or if the powder gets damp.
Make a cinnamon spray (optional). In a small spray bottle, combine the water and cinnamon essential oil (if using). Shake well. Spray this solution directly on ants, on their trails, and around entry points. The oil helps the scent linger longer than water alone.
Place cinnamon sticks. Tuck whole cinnamon sticks along windowsills, under cabinets, and near baseboard gaps. The sticks release a steady scent that repels ants for several weeks.
For heavy infestations, combine methods. Use both the powder barrier and the spray. The powder physically blocks the path, while the spray kills ants on contact and masks the trail.
Monitor and reapply. Check the barriers daily for the first week. Reapply after cleaning, spills, or rain (if used outdoors).

Tips

Use Ceylon cinnamon for better results: True cinnamon (Ceylon) has a stronger, sweeter aroma than cassia (the common supermarket variety). If you can find it, it works better as a repellent.
Don’t mix with water unless using oil: Ground cinnamon alone doesn’t dissolve well in water. If you want a spray, use cinnamon essential oil, not ground spice, to avoid clogging the nozzle.
Seal food containers: Cinnamon only works if ants don’t have a better food source. Store sugar, flour, and pet food in airtight containers to make your home less attractive.
Combine with diatomaceous earth for killing power: If you need to actually kill the colony, mix cinnamon powder with food-grade diatomaceous earth. The cinnamon masks the dust, and the diatomaceous earth cuts the ants’ exoskeletons, causing dehydration.

Serving Suggestions

This isn’t a dish, but a home remedy. Use it as a daily preventive during ant season (spring and summer). Reapply every few days or after cleaning floors. For best results, pair it with good sanitation: wipe counters, take out trash, and fix any leaks.

Variations

Cinnamon and clove blend: Mix equal parts ground cinnamon and ground cloves. Clove oil is also a known ant repellent, and the combination smells like a holiday candle.
Outdoor barrier: Sprinkle a thick line of cinnamon around the foundation of your house, near ant hills, or along garden paths. Rain will wash it away, so reapply after storms.
Cinnamon sachets: Fill small muslin bags with cinnamon sticks and place them in drawers, closets, and pantry shelves. They last for months and can be refreshed by adding a drop of cinnamon oil.

Storage and Reheating

Ground cinnamon and cinnamon sticks should be stored in a cool, dark, dry place in airtight containers. They will last for up to 3 years, but their potency decreases over time. The cinnamon spray (water and oil) should be used within a few days; shake well before each use. The powder barriers need to be reapplied every 1-2 weeks, or after cleaning. Cinnamon sticks placed around the house can be reused until they lose their scent (usually after 2-3 months).

Frequently Asked Questions

Does cinnamon actually kill ants? Yes, but not instantly. Ground cinnamon can kill ants that ingest it, but it’s more effective as a repellent. The fine powder can also clog the ants’ breathing pores (spiracles), causing death by suffocation, but this takes time. For a faster kill, use cinnamon essential oil spray.

Why do ants avoid cinnamon? Ants rely heavily on their sense of smell to follow pheromone trails. Cinnamon contains cinnamaldehyde, a compound that is overpowering to their olfactory system, disrupting their ability to navigate. It essentially blinds them to the trail, so they get lost and go elsewhere.

Is cinnamon safe for pets? Ground cinnamon is generally safe for dogs and cats in small amounts, but large quantities can cause stomach upset or respiratory irritation if inhaled. Cinnamon essential oil is more concentrated and can be toxic to pets, especially if ingested. Keep essential oils away from pets and use ground cinnamon in areas they can’t access.

How long does cinnamon keep ants away? The repellent effect lasts as long as the scent is strong. Ground cinnamon powder will remain effective for about 1-2 weeks indoors, but it loses potency if it gets damp or dusty. Cinnamon sticks last longer, up to a few months, but need to be replaced once you can no longer smell them.

Can I use cinnamon to kill ants outdoors? Yes, but it’s less effective because rain and wind will disperse the powder. For outdoor use, mix cinnamon powder with a little water to make a paste and apply it to the base of walls or along ant trails. Reapply after heavy rain.

What’s the best way to apply cinnamon to kill ants? The most effective method is to create a thin, continuous line of ground cinnamon at entry points. This acts as a physical and chemical barrier. For ants already inside, use the cinnamon spray (water + essential oil) to kill them on contact and wipe down surfaces to remove their trails.

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