Browse resources Displaying 1 - 2 of 2 resources Used appropriately, coffee grounds improve soil and kill slugs Coffee grounds can be worked into the soil or added to a compost pile but should be done with some restraint. Kym Pokorny | Jun 23, 2023 | News story Photo: Wikimedia Commons (Cropped from original) Analyze your garden soil at home with the jar test Learn how to do a simple test with few materials to see how much of the soil is sand, silt or clay. Jun 2018 | Article