Coffee Grounds in the Garden
...amount to more than 20% of your compost pile. Don’t add coffee grounds to vermicomposting bins. If you’re using coffee grounds as a mulch Chalker-Scott has two suggestions: Apply a thin layer (no more than half an inch) of coffee grounds. Cover with a thicker layer (four inches) of coarse organic mulch like wood chips (Chalker-Scott 2015). This will protect the coffee grounds from compaction. Don’t apply thick layers of coffee grounds as a standa...