Coffee Grounds Rats. It’s a surprisingly powerful deterrent that works on one of the insect’s most valuable assets: Coffee grounds can also be used to fertilize your garden, especially if you’re growing a lot of herbs and vegetables.
But not everyone has a cat and even if you do, not every cat is cut out to be running mice and rats to the ground. Coffee grounds work as a natural deterrent because ants don’t like the smell. Two diterpenes called cafestol, and kahweol raise cholesterol.
