Hydrangeas have a reputation for being chamaeleons, but not all hydrangeas change color. Generally you will need to grow Big Leaf Hydrangeas, Hydrangea macrophylla, to get the pink or blue color you are seeking. You neednt become a chemist, but you will need to understand why your hydrangeas change color. Here's why.
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[Source: About.com Gardening: Most Popular Articles]
