Vitax Hydrangea Flower Colourant - Pink to Blue - 250g

Follow the application instructions on the pack, typically once or twice during the growing season.

Yes, but results are most noticeable on pink varieties. Color change may be less pronounced on other colors.

The best time to apply is during the growing season, starting in early spring, according to the product instructions.

If you apply it around the base of the plant, it will only affect the hydrangeas you treat.

You should start to see the color change when the next blooms appear, typically within a few weeks to a couple of months.

Ensure you're using the product on suitable hydrangea varieties (pale pink works best). Check the soil pH; it should be slightly acidic. Make sure you are following the application instructions correctly.

The initial color of the hydrangea can affect the final result. Darker pink varieties may produce mauve, not true blue. Ensure proper application and consider a second application if needed.