Hydrangea - Knowledgebase Question

Sheboygan, Wi
Question by rupnik
April 2, 2010
I have several

Answer from NGA
April 2, 2010


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. To keep the soil more acidic, feed regularly using a granular fertilizer for acid loving plants such as Hollytone, and by using an acidic mulch such as peat moss or pine needles. Often this kind of care regime is enough to make the difference. Don't look for immediate change - it sometimes takes an entire year for the soil pH to be lowered. Enjoy your hydrangeas.

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