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Cool!! I never thought about trying to amend the soil.It may have been blue when planted. The soil may be very alkaline which turns them pink. You can turn the hydrangea whatever color you want by adjusting the ph of your soil. I turned my other blue hydrangea purple by adding lime around the base of the plant. If they’re pink and you want them blue you have to amend the soil to make it more acidic.
View attachment 288910
View attachment 288911
If I don’t dig them up next year, I'm going to buy a bag of this or the Miracid that @snowbear mentioned. I might even have some of that in the garage.