Changing The Color Of Hydrangeas - Knowledgebase Question

Port Orchard, WA
Avatar for chelansun
Question by chelansun
April 7, 2000
What do you add to the soil to change the color
of of a blue hydrangea to pinkish/purple?

Answer from NGA
April 7, 2000
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 soil in the Pacific Northwest is on the acidic side, apply lime or superphosphate to the soil now and this summer's blooms should be pink.

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