Why Placing Cloves in an Onion Is a Household Trick Worth Trying

The method is simple: peel an onion, insert 6–12 whole cloves, place it on a plate near the bed or in a sickroom, and leave it overnight or up to a day. Traditionally, people believed it could absorb “germs,” ease nasal congestion, support sleep, neutralize odors, and create a calming environment. Science shows onions contain sulfur compounds and antioxidants, while cloves contain eugenol—both with mild antimicrobial properties.

However, these ingredients do not pull viruses or bacteria from the air or cure illness. The onion turning black is due to oxidation or moisture, not germs. Real benefits are mostly sensory: the aroma can open nasal passages, onions release slight humidity, and the scent combination masks stale odors. The ritual itself can also provide emotional comfort and a sense of care.