Q: Is there a way to change flower color on oakleaf and tree hydrangeas?
A: No, the old-fashioned bigleaf hydrangea is the only one that responds to soil pH to change flower color.
Oakleaf hydrangea flowers are white when they open but they fade more or less rapidly to pink or dark red. Different varieties have different size flowers, different mature sizes, and different rates of color change.
Panicle hydrangea flowers range in color from white to pink to light green, depending on variety. Look at ‘Summer Snowflake’, ‘Limelight’, and ‘Strawberry Sundae’ for an idea of what you can find.