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Hydrangeas & Coffee Grounds

by Richard Hoyt
You can change the blossoms of Hydrangeas (Hydrangea spp.) from pink to blue by increasing the acidity of the soil. While adding coffee grounds may reduce soil pH, making it more acidic, the effect is temporary. Using coffee grounds as compost or mulch may benefit these perennial flowering shrubs.
Jane Janda
Jane Janda • 3 years ago

Hydrangeas & Coffee Grounds