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Wait, Why the Heck Are People Leaving Coffee Grounds on Their Porch?

Summary by The Spruce
Luis Echeverri Urrea / Getty ImagesKey PointsPeople scatter coffee grounds on porches to deter pests, but science doesn’t strongly back this up.Experts say the caffeine and scent levels in used grounds are too weak to deter bugs effectively.While not great as pest control, use old coffee grounds as compost, plant fertilizer, natural cleaner, and odor absorber.Some gardeners and homeowners sprinkle coffee grounds on porch, patio, and other outdoo…

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The Spruce broke the news in on Sunday, July 6, 2025.
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