Hydrangea macrophylla is commonly called the mophead type, and their flowers are what most gardeners long for: “People lust after those big blue flowers that we go gaga about and people don’t ...

A pH between 6 and 7 will net purple or pinkish-blue blooms. Hydrangea flowers purchased at a nursery might well change color once they are placed directly in the garden. You can control the color ...