The Q&A Archives: Hydranga Blooms

Question: 2nd year they have no color. They are large but are light green. They usually are Purple/ Light Blue and Deep Pink.

What do I need to do to produce each color?

Answer: Soil acidity or alkalinity will change the color of hydrangea blooms. You can change the color back by treating the soil. Pink and red hydrangeas often turn blue or purple in acid soils, and plants can be made red by liming the soil or applying superphosphate. 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.) For pink flowers, add lime to the soil, to raise the pH above 7.8). Test your soil to measure the pH range.

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