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.

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.