Changing your hydrangea flowers to blue, pink or purple isn't a magic trick. It's a doable science experiment.

lower the soil pH with a specialty fertilizer or aluminum sulfate. To turn hydrangea blooms pink, raise the soil pH with a specialty fertilizer or garden lime," says Vater, adding that the best ...

Nitrogen is essential to good fertiliser ... acidic which hydrangeas prefer as it can enhance their nutrient uptake, plus can change the colour of the blooms. Transform your pink hydrangeas ...