Coffee grounds can work to deter snails and slugs in your garden, but it won't keep out deer or rodents. These pests are unfazed by the coffee odor.
Common Yard Pests That Aren't Bothered By Coffee Grounds

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Coffee grounds can work to deter snails and slugs in your garden, but it won't keep out deer or rodents. These pests are unfazed by the coffee odor.