Westland Hydrangea Colourant is a salt which changes pink hydrangea varieties to blue, it also changes darker pink varieties to mauve blue.This colourant easily absorbs nutrients, as well as nitrogen for greener leaves. Some Hydrangeas are bred to show pink flowers in all conditions, please check the plant label. When using Westland Hydrangea Colourant, obtain the best results with plants growing in acid soils.Use ericaceous compost where the soil is naturally alkaline and alternatively, double the application rate. How to use:Established shrubs; Mix the Hydrangea Colourant into the soil at the rate of 50g per square metre. Do not apply directly on plant foliage.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. Container-grown Hydrangeas; 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. Features:Changes flowers from pink to blueAcidifies the soil to produce blue flowersA combination of iron and aluminium saltsCan be added to alkaline soil to change pHFor best results use with ericaceous compostPack Size: 500g
