Westland Hydrangea Colourant 500g

Hydrangea Colourant is a salt which changes pink hydrangea varieties to blue. By nature, the salt acidifies the soil to produce blue flowers. For best results, grow plants in acidic soils and use ericaceous compost where the soil is naturally alkaline or double the application rate.

Features:

• A combination of iron and aluminium salts
• Acidifies the soil to produce blue flowers
• Potassium to boost flowering