How to use:
When planting, apply 50g (one capful) per square metre and mix into soil. Every 7 days during growing season, dissolve 50g in 5 litres of water and apply to the soil around the shrub, avoiding foliage.
Please note: white flowers will not change colour, and some pink hydrangeas are bred to keep their colour in all soil conditions so will remain unchanged. Make sure to check the plant label before use.