Vitax Hydrangea Colourant Changing Pink to Blue - 250g
- Hydrangeas growing in the presence of iron or alluminium salts which will tend to change colour and produce blue flowers
- Varieties naturally pale pink tend to blue best, the darker pink varieties turning to muave/blue
- Best results are obtained with plants growing in acid soil
- Pale pink varieties tend to blue best
- Darker pink varieties turn to mauve/blue
- Treat as per pack instructions