The Q&A Archives: Hydrangea Bloom Color

Question: I heard you can use vinegar to change for brighten the color
of the blue flowered hydranges. Is this true & how much?

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, add aluminum sulfate to the soil in February or March and this summer's blooms should be blue.

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