Hydrangea Colourant is a salt which changes the colour of pale pink hydrangea varieties to blue and darker pink varieties to mauve blue.
Key features:
- Changes flowers from pink to blue
- Acidifies the soil to produce blue flowers
- A combination of iron and aluminium salts
- Can be added to alkaline soil to change pH.
- Easy to use
Hydrangea Colourant
For established shrubs - 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. For 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. Best results are obtained with plants growing in acid soils. Where the soil is naturally alkaline use an Ericaceous compost (such as John Innes Ericaceous Compost or Gro-Sure Ericaceous Compost) instead or double the application rate.
Always read the product label before use. For full safety information please see the product Safety Data Sheet (SDS). WARNING: causes Serious Eye Damage Contains Aluminium Sulphate Hexadecahydrate CAS No. 10043-01-3 Keep out of reach of children Wear protective gloves and eye protection If in Eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Immediately call a Poison Centre or a doctor/physician.
