Hydrangeas - Knowledgebase Question

Chicago, Il
Question by cicp62
July 6, 2010
Are Hydrangeas acid loving plants and is it true that the color of the flowers changes as the pH of the soil changes?


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Answer from NGA
July 6, 2010

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Hydrangeas are adaptable to most soils. Hydrangea bloom color can be affected by soil pH. A somewhat acidic 5.5 should turn them blue, a more alkaline 6.0 should turn them pink with the effect being more intense the more extreme the pH. 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.

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