Westland Hydrangea Colourant 500ml

Hydrangea Colourant is a salt which changes the colour of pale pink hydrangea varieties to blue and darker pink varieties to mauve blue
How to use
Mix the Hydrangea Colourant into the soil at the rate of 50g per square metre.
Every 7 days during the growing season dissolve 50g of hydrangea colourant in 5 litres of water and apply to the area of soil covered by the shrub.
Do not apply directly on plant foliage.
Or for containers...

When potting, mix the Hydrangea Colourant into the compost at the rate of 50g per 5 litres of compost.
Every 7 days during the growing season dissolve 50g of hydrangea colourant in 5 litres of water and water the soil round the plant.