Acid for Hydrangeas

TheGardenLady received this question from Martha:

How can I add acid around my hydrangeas?

Because hydrangeas like an acidic soil – especially if you want the blue blooms- you can supplement the fertilizer and add acid.  Know that not all the hydrangeas will change color. Usually it is the pink and blue hydrangeas that can have their flowers change color, not the white or red hydrangeas.

Any of the following will help: aluminum sulfate (1/4 oz. per gal. of water) which can be bought in many garden stores, egg shells, coffee grounds which you can get free, TheGardenLady was told, at places like Starbucks,  ground up orange or grapefruit peels.

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