“Homespun recipes abound for changing the pink blooms of a hydrangea to blue: pouring vinegar or lemon juice on the soil and mulching the plant with coffee grounds.” The site shared that this ...

Panicle hydrangeas are generally much more cold hardy than bigleaf hydrangeas (for example, a 'Limelight' panicle hydrangea is hardy in USDA zones 3 to 9, while a 'Nikko Blue' bigleaf hydrangea is ...