Hydrangea Colour
Hydrangea Colour and the Soil
The acidity of your soil will affect the colour of blue, pink and
mauve hydrangeas. Acid soil will give blue flowers, neutral to
alkaline soil will give pink flowers. If your hydrangea is white it
will always be white regardless of the soil.
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The blue colour comes from hydrangeas which take up aluminium.
So the secret to making your hydrangeas blue on soil which is not
naturally acid is to add aluminium sulphate to the soil. Don't do
this every year though, it can cause problems. Alternate aluminium
sulfate one year with sequesterd iron the next. |
There are lots of hydrangea colourants on the
market. Be aware though, to get the bluest booms you really need
naturally acid soil, the pH should be between 4.5 to 5.0.
Hydrangea Pest and Disease
Hydrangea are very free of pests and diseases. The occasionally get
attacked by powdery mildew but not often (click
here for how to deal with powdery mildew).
What does cause problems with hydrangeas is the site of the plant and
pruning. Follow the pruning instructions given on previous pages and you
will be OK. As for site, if the variety you buy requires full sun, do
just that. If it likes partial shade, that means around six hours of sun
a day, do that.
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