Hydrengas - Knowledgebase Question

Saratoga, Ca
Question by psrokes
April 10, 2010
How do I keep my hydrengas blue?


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Answer from NGA
April 10, 2010

0

Soil acidity or alkalinity will change the color of hydrangea blooms. You can change the color back by treating the soil. For blue flowers, 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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