Here are some of the hydrangea varieties that can change colors: Nikko Blue Hydrangea (Hydrangea macrophylla ‘Nikko Blue’) ...
These are bigleaf (Hydrangea macrophylla), panicle (Hydrangea paniculata ... Popular varieties include the classic 'Nikko Blue,' or 'Blue Jangles,' or the 'Endless Summer' hybrids, including ...