Do Onions Get Rid of Moles?

Yes, onions can help get rid of moles. The strong scents of plants in the allium family, like onions, act as natural mole repellents.

How Onions Repel Moles

Onions, like other alliums, have a potent smell that moles find unpleasant.

Moles have a highly developed sense of smell which they use to find food and navigate their tunnels.
The strong sulfurous compounds released by onions disrupt a mole’s ability to find food and creates an unpleasant environment.
This can deter them from establishing tunnels in areas where onions are planted.

Here’s how you can use onions to deter moles from your garden:

Plant Onions Strategically: Plant onions in areas where moles are active or where you want to prevent them from digging.
Companion Planting: Combine onions with other mole-repelling plants such as garlic, daffodils, and marigolds for a more effective approach, as suggested in the reference: "Plants in the allium family can also repel moles thanks to their strong scents. Planting onions and garlic in with your daffodils and marigolds means you'll get plenty of free veg and keep your garden free from moles."
Use Onion Extracts: Another option is to use onion extracts or oils, diluted, and sprayed or poured into mole tunnels.

Using onions as a repellent is beneficial:

Natural and Safe: It’s an eco-friendly and safe method, avoiding harmful chemicals.
Dual Purpose: You get the added benefit of a vegetable harvest.
Cost Effective: Onions are an affordable option compared to commercial repellents.

While onions can be effective in deterring moles, results can vary:

Not a Guaranteed Solution: They may not completely eliminate moles, especially if infestations are severe.
Combination Works Best: It often works best as part of a broader strategy that may include other types of natural repellents or deterrent methods.

Method	Effectiveness	Safety	Cost
Planting Onions	Moderate	Safe	Low
Companion Planting	Moderate to High	Safe	Low
Onion Extracts	Moderate	Safe	Low to Moderate