The Q&A Archives: Color of Hydrangea Blooms

Question: Last year I planted what was supposed to be a blue hydrangea. It bloomed for the first time this year but it's pink. I've heard that the ph level can affect the color of the bloom. Is this what's happening? If so, is there a way to alter the ph so my blooms are blue?

Answer: Pink and red hydrangeas often turn blue or purple in acid soils. Blue hydrangeas can turn pink in alkaline soils. Plants can be made (or kept) blue by applying aluminum sulfate to the soil; plants can be kept pink by liming the soil or applying superphosphate. Since your soil is alkaline, as evidenced by the change from blue to pink, add aluminum sulfate to the soil this fall and next year's blooms should be blue.

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