Your soil must be acidic. You can but buy "paint me pink" at your local Lowes or home depot. Mine are pink due to my alkaline soil and I finally decided to just go with the flow and leave them be.

I'll try another Lowes. My local one didn't know what I was talking about.
However, that doesn't help with my blue Annabelle. I bought it for the beautiful white flowers which have gradually over several years become more and more blue.
Any ideas?

my bb also turn bluish because of the acid soil-I grow some in pots and they do not blue-try that or use a fertilizer with a high middle number-that may help keep the blue out. You got a mislabeled Annabelle-they do not turn pink or blue-they go green, white, green-never blue or pink

hokier is right. There is no way you can turn Annabelle blue or pink. If yours ever gets bluish or pinkish, then it is not Annabelle.

Kate