My nana swears by onions for getting rid of pests like rats, flies, bugs, and mosquitoes. Here’s how it works.

In an age of chemical insecticides and expensive traps, it’s worth reaching for something much simpler, cheaper, and—most importantly—natural. My nana, like any wise grandmother, knows methods that have worked for generations. Her biggest secret? A simple onion.

It’s no joke—onions can really help fight pesky household pests like rats, flies, bugs, and even mosquitoes. Find out how it works and how you can apply it in your home.

Why do onions work?

Onions contain organic sulfides and other compounds with a very intense odor, which:

irritates the nervous systems of insects and rodents,

repels many household pests,

interferes with olfactory communication (for example, rats leave scent trails that onions mask).

For us, the smell of onions is merely a nuisance, but for pests—a real alarm signal.

How does onion help control specific pests? Rats

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