Watch the burning grounds to be sure they are under control and safe. Acting as a natural repellant, the smokey scent will start to travel.
Coffee grinds have substances including caffeine and diterpenes that help to repel insects like flies and mosquitoes. These chemicals burn and spew into the atmosphere, therefore making the surroundings hostile for these pests.
Bonus Advice:
Combining the coffee grinds with bay leaves—also having insect-repelling qualities—will help to boost the repellent effect.
Use inside; make sure ventilation is adequate to prevent smoke accumulation.
For optimum results, keep repeating this technique as necessary—especially in peak mosquito hours or when you see more active flies.
In essence, burning coffee grounds is a great natural substitute for chemical repellent. In addition to deterring unwelcome pests, it recycles your discarded coffee grounds and smells the air richly and aromasically. Try it and your house will have a more pleasant, bug-free surroundings.
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