- A combination of iron and aluminium salts
- Acidifies the soil to produce blue flowers
- Potassium to boost flowering
Why Use
To help rooting and establishment of cuttings
What to Expect
Pink Hydrangeas will produce blue flowers and darker pink Hydrangeas will be mauve. Some Hydrangeas are bred to show pink flowers in all conditions — please check the plant label.
When to Use
April to September
How to Use
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.
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.
Q. Will my pets or wildlife be attracted to this product?
A. Hydrangea Colourant doesn’t contain any organic elements so shouldn’t be attractive to animals.