I think if your soil is close to neutral the plant will keep the color on the tag. Higher or lower in PH, and all bets are off.I do not fuss with the colors. In fact in the same garden I have hydrangeas with various colors. Same soil etc.
Nor I. What happens, happens. Besides I'm a sucker for surprises! (The good kind, of course)then it might be. But be honest, I do not test it. My gardens are too vast for me to fuss with that. And still I get wonderful surprise colors.
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