How can coffee grounds be used as fertilizer?
If you compost, just dump them into your regular compost bin; they have a carbon-to-nitrogen ratio of 20:1, about the same as grass clippings. After used to make coffee, grounds contain up to 2% nitrogen. They are acidic with a pH of between 3.0 and 5.0, making them perfect for mulching rhododendrons, azalea and other acid loving plants.
