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Hydrangeas bloom throughout summer and fall. They have large bold leaves and large clusters of
flowers.
In some hydrangea varieties the color is affected by the pH content of the soil.
flowers.
In some hydrangea varieties the color is affected by the pH content of the soil.
- A blue color flower can be maintained if the hydrangea is planted in a soil with a strong acid
content (a pH level of below 5.5). Flowers can be kept (or made) blue by adding aluminum sulfate
to the soil.
Pink or red flowers can be maintained in a neutral or alkaline soil (a pH level of 7.0 or higher).
They can also be kept or made pink / red by adding superphosphate or liming the soil.
- It is not unusual for a plant to change from blue flowers to pink flowers when it is planted out,
depending on the pH level of your soil. This is not a process that can be achieved overnight, the
soil must be amended prior to the flowers blooming.
| For more information http://www.usna.usda.gov/Gardens/faqs/hydrangeafaq2.html |