Change color of hydrangea - Knowledgebase Question

Kent, Wa
Question by jmarshall65
June 30, 2010
Is it possible to change a light blue to a darker blue on a hydrangea? Thanks!


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Answer from NGA
June 30, 2010

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Hydrangea color is somewhat genetic but soil pH can also affect the color. While your soil is naturally acidic, which is what makes a hydrangea blue, you may be able to acidify it a little more to get a darker blue color. Treat the soil with 2 Tablespoons of aluminum sulphate per plant, making 4-6 applications at 2 week intervals, starting in the early spring before the plants bloom. (Sulfur will acidify the soil. The desired pH range would be between 5.5 and 6.)

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