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

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

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…

Are Coffee Grounds The Secret Hack To Thriving Gardenias? Here's What We Know - House Digest

Used coffee grounds can't acidify the soil, nor will they supply nutrients to your gardenias. That said, they enhance the soil indirectly and keep pests away.