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You could sprinkle a small amount of coffee grounds on the soil surface around your plants from time to time, the coffee grounds will supply a small amount of nitrogen and a small amount of acidity to the soil as well as supply some organic matter. (Acid soil will accentuate the blue in hydrangeas, while alkaline soil will accentuate the pink coloring in hydrangeas that are pH sensitive.) If you have larger amounts of grounds or a steady supply, such as from making coffee every day, you could add the grounds to your compost pile. |
