What can I do to bring it back to a good red.

Thanking you.

Keith

To lighten or pink a hydrangea
Success in doing this will depend on the variety of hydrangea as some varieties will simply not lighten to pink. You will also need to raise the pH. In doing this you will stop the hydrangea from taking up any naturally occuring aluminum present in the soil and therefore, stopping the blueing process. Lime is the best way for the home owner to raise the pH level. Add dolomitic lime 3-4 times a year starting in the early spring or even the previous fall. Applying a fertilizer high in phosphorus will aid in keeping aluminum out of your hydrangeas system. On the bag you will see the n-p-k ratio. Phosphorus is the middle number. You will want a fertilizer with an elevated level of phosphorus such as 10-20-10. Foundation plantings are often exposed to higher levels of lime due to the cement foundation itself leaching it out over time. If you are planting up next to the house, you may not need to add anything to the soil for pink flowers.