When was the last time you tested your soil’s pH? If you can’t remember, that may be why your hydrangeas are turning brown.

particularly the widely-cultivated bigleaf hydrangea (Hydrangea macrophylla), is primarily determined by the pH level of its ...

A gardening expert called Ish has confirmed if pruning hydrangeas during winter is really a good idea. It's something that confuses a lot of people.