How to Keep Hydrangeas in the Pink (or Blue!)
Easy
If you’re head over heels for vivid hydrangeas, you know how captivating bigleaf hydrangea (Hydrangea macrophylla cvs.) blossoms can be. You may also know the disappointment of having your favorite vibrant pink or brilliant blue flowers shift color unexpectedly. Manipulating hydrangea colors isn’t difficult once you comprehend the reason behind the change. Understanding what causes pink or blue hydrangea blooms can help you keep that perfect shade.
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I have blue hydrangeas. My solution is to cover the plant with pine needles in the late fall. The different acids coming from the different kinds of pine trees, is what determines the color it turns out. I think I have norway pine needles. If they are a long needled tree, then that is what I get.
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My grandmother used rusty nails to change the colors....she put a bunch of them in the soil.
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