Households are being encouraged to place bowls of used coffee grounds on windowsills before the end of summer to repel pests and neutralise unpleasant smells. The simple, natural method has been endorsed by gardening and home experts as a safe and effective alternative to chemical products.
How the mixture works
Combining used coffee grounds with bicarbonate of soda creates a powerful odour-absorbing and pest-repelling blend. The grainy texture of coffee grounds naturally soaks up smells, while bicarbonate of soda is known for its neutralising properties. According to specialists at TheKitchn, coffee contains nitrogen, which helps neutralise odours rather than just masking them, offering a much cosier scent than baking soda.
The mixture can be placed in various spots around the home and garden, including the fridge, bin, car, patio, or windowsills. Gardening experts at WWNursery have endorsed this approach for repelling insects, particularly when positioned near doors and windows.
Why insects dislike coffee grounds
Most insects, including spiders and mosquitoes, have a highly developed sense of smell and find the potent aroma of coffee grounds deeply unpleasant. The gardeners at WWNursery stated: "As unlikely as it sounds, the solution is coffee grounds! Coffee grounds are a safe and effective way to keep pests away. Coffee grounds can help repel not only mosquitoes but also other annoying insects like wasps and bees."
Additional uses around the home
TheKitchn experts explained: "The grounds naturally absorb all kinds of funky smells and leave behind a very light coffee aroma." They suggested using the mixture in the kitchen trash, fridge, freezer, car, or near litter boxes and pet areas. The US Department of Agriculture also advised: "Sprinkle fresh coffee grounds or baking soda loosely in a large, shallow container in the bottom of the refrigerator and freezer."
How to prepare the natural mix
To prepare the mixture, simply place the used grounds on a plate or baking sheet to dry completely. This step is important as wet coffee can get mouldy quickly. Once dry, place the coffee into a bowl or small container or bag and add two or three spoons of bicarbonate of soda. Then place the bowl wherever you need a little help with odour or pests.
