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.
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A combination of iron and aluminium salts
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Acidifies the soil to produce blue flowers
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Potassium to boost flowering
How to use
For established shrubs:
Mix colourant into the soil at the rate of 50g per square metre (1 capful per square metre)
Every 7 days during the growing season, dissolve 50g of Hydrangea Colourant in 5 litres of water (1 level capful per 5 litres of water) and apply to the area of soil covered by the shrub
Container-grown Hydrangeas:
When potting, mix Hydrangea Colourant into the compost at a rate of 50g per 5 litres of compost (1 capful per 5 litres).
Every 7 days during the growing season, dissolve 50g into 5 litres of water. Apply to the soil around the plant.
