Is it time to change the color of my hydrangea?

What time of the year is the best time to add acid solider to my established pink/mulberry colored hydrangeas? I am really really wanting blue blooms this season! It is currently January should I start adding the acid solider now? How much how often?

This is a great website for the fertilizing, color and care of bigleaf hydrangea. Please note the section about color determination of the flowers. It has detailed instructions about how to bring about those changes you requested.

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