My three formerly blue hydrangeas are planted with a tarp on the soil and small rocks and pebbles around them and other plants. Bricks were used as an edger. The complex uses a landscape service, and I'm not allowed to plant or remove things in the landscape. My hydrangeas were purchased blue. What can I do?
Md Ariful Islam
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Dr. Md Rushad Rahman
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My best guess is that the pebbles and brick contain limestone, which is easily dissolved in water and will raise the pH of the soil. You'll have to water with a slightly acidic water.
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