Answer: The mix you are seeing is probably due to the plant being in the process of rooting outward from the original soil mix into the native soil. Your local soil is probably quite acidic so encourages the blue coloring, the potting mix have been treated with lime to make it slightly less acidic and therefore encourage the pink. I would suggest you wait several years and see what color your hydrangea eventually settles into displaying, and then adjust if desired. It is not at all uncommon for new hydrangeas to display a varying range of colors. Enjoy!
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