You will also need to regularly test the soil using a pH soil tester to make sure the ground is becoming more acidic
but it should only take a small amount of coffee to help hydrangeas.
John said: "If your starting pH is neutral you don't need to add a huge amount of coffee grounds
"If you have a start point on the alkaline side of the scale, however, you need to take your soil through the neutral point
This takes more work and more coffee grounds and is not always very effective. You're "looking for pH 6 to pH 6.5 to get the best blue flowers
Coffee grounds act as a soil amendment to help hydrangeas retain water which will make their flowers much bigger and more abundant.
John said: "Adding coffee grounds, which are an organic matter, to your soil adds nitrogen and in turn, this helps the stem, leaf and root development of your plants.
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