Use if Hydrangeas are pale blue in colour and you want to intensify the colour, or they are pink and you want to turn them blue.

Acidic soil ( pH 4.5- 5.5) produces blue flowers, less acidic soil (pH 5.5 – 7 ) produces pale purplish flowers, and alkaline soil (pH 7 – 8.5) produces pink flowers

Easy to use and apply by watering can application: no messy dusty powders to handle.