Used Coffee Grounds

A number of plants prefer a more acidic soil, and are known as acid-loving plants. These include pine, spruce, white cedar, azalea, rose, hydranga, holly, rhododendron, blueberry raspberry, and dogwood. Dumping your used coffee grounds around these plants is beneficial to them.
Coffee grounds can also be used in the compost as a "green" material, to go with the dried materials.
I have just learned that some coffee shops make their used coffee grounds available for gardeners for free if you ask. I am going to check this out and report back soon.