![]() But you also can use spent grounds in small amounts as a thin mulch layer for outdoor plants. In general, only composted grounds should be worked into the soil as an amendment. ![]() In addition, earthworms consume coffee grounds and pull them deep into the soil, so this may be why there’s improvement in soil structure after the application of grounds. They also contain small amounts of other primary nutrients such as phosphorous and potassium, as well as micronutrients such as calcium, magnesium, and copper. “Used coffee grounds contain nitrogen, so it’s a good addition to the compost pile.”Ĭoffee grounds have other benefits when added to compost. ![]() “Not everything contained in coffee beans makes it into the cup,” says Linda Chalker-Scott, PhD, professor and extension urban horticulturist at Washington State University. Adding used coffee grounds to your garden or compost pile is a great way to use something you’d otherwise toss. ![]()
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