So which plants will appreciate added acidity? Generally, acid-loving plants will appreciate a boost with coffee grounds. Plants such as roses, blueberries, azaleas, radishes, rhododendrons, hydrangeas, cabbage, lilies, and hollies.
Alternatively, coffee grounds and used coffee filters can be added to your compost pile. When added to your compost pile they act as ‘green materials’ because they are higher in nitrogen. Therefore, they need to be balanced out with ‘brown material’ such as cardboard, paper, and straw.