Westland Hydrangea Colourant 500g is a simple way to turn pink hydrangea blooms blue or shift deeper pink varieties to mauve blue. It contains a blend of iron and aluminium salts that acidify the soil so plants can take up the minerals needed for blue colouring. The formula also includes nitrogen for greener foliage and potassium to support flowering. Best results are achieved in naturally acidic soil. In alkaline soil use ericaceous compost or double the application rate to help the colour change take effect.
Features
- Contains iron and aluminium salts for blue colouring
- Acidifies soil to encourage blue blooms
- Potassium supports healthy flowering
- Nitrogen helps maintain greener foliage
- Works best in acidic conditions
- Suitable for use with ericaceous compost in alkaline soils
