Experts and BHG readers answer.
leaves turning brown on hydrangea
It sounds like your hydrangea might be getting a little more water than it needs. While hydrangeas like moist soil, they don't like wet or soggy soil --- so I'd give the top inch or so of your soil a chance to dry out between waterings. That may mean watering only once or twice a week, depending on how well your soil drains.
---Justin, Senior Garden Editor, BHG.com "