HAU Hydrangeablue 1lt

Watering water additive with alum for blue colouring of hydrangea flowers, produces beautiful blue flowers.
Application: Dilute Hydrangea Blue with water and pour evenly over the root area onto the soil.
Dosage: 0.25-0.5%
Please note: Do not apply directly over the plants. An intense blue is only achieved in chalk-free, slightly acidic soils.