Welsh households are being encouraged to place bowls of used coffee grounds on windowsills as a natural and effective method to repel pests and absorb odours. The simple yet powerful combination of coffee grounds and bicarbonate of soda can tackle unwanted smells and keep insects at bay, according to gardening and home experts.
How Coffee Grounds Work
Used coffee grounds have a granular texture that naturally absorbs odours, while bicarbonate of soda is renowned for its neutralising properties. Together, they create a potent mixture that can be deployed in various areas around the home and garden. The US Department of Agriculture recommends sprinkling fresh coffee grounds or baking soda loosely in a large, shallow container placed at the bottom of the refrigerator and freezer to combat food smells.
Gardening experts at WWNursery have highlighted the effectiveness of this approach for repelling insects, particularly when positioned near entry points like doors and windows. Most insects, including spiders and mosquitoes, possess a highly developed sense of smell and are strongly deterred by the pungent aroma of coffee grounds.
Expert Endorsements
The gardening specialists explained: "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."
Experts at TheKitchn noted that coffee contains nitrogen, which actively neutralises odours rather than merely masking them, similar to baking soda but with a more pleasant scent. They elaborated: "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 to absorb musty smells.
Simple Preparation Method
To create the natural solution, households should follow these steps:
- Place the used coffee grounds on a plate or baking sheet to dry completely, as wet coffee can quickly develop mould.
- Once dry, transfer the grounds into a bowl, small container, or bag and add two to three spoonfuls of bicarbonate of soda.
- Position the bowl wherever odour or pest issues arise, such as windowsills, doorways, or the refrigerator.
This method offers a cost-effective, chemical-free alternative to commercial air fresheners and insecticides, making it an appealing choice for environmentally conscious households in Wales and beyond.
