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Gardening

In reply to the discussion: Hydrangea 'colors' [View all]

elleng

(140,172 posts)
6. Color relates to pH of the soil.
Sun Jun 22, 2025, 07:59 PM
Jun 22

For optimal growth and blue blooms, hydrangeas generally prefer acidic soil with a pH range of 5.2 to 5.5. However, the desired pH can vary based on the hydrangea variety and the desired flower color.

A pH of 7 is neutral. Alkaline soils have a pH of 7.5 or more. Hydrangeas grow best in soil that has a pH of 5.2-5.5. If your soil is not in that range, you will need to manipulate the soil so the plant can absorb its needed nutrients.

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