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Hydrangeas are a type of plant whose flower clusters can be as large as your head. The flower color can be changed by altering the pH of the soil. Acidic soil produces pink flowers, and neutral or slightly basic soil produces deep blue flowers. An experiment was conducted growing 20 hydrangeas using soil with a pH of 4.5 (acidic) and another 20 in soil with a pH of 7.0 (neutral).
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