Posted: 30/08/2015 at 08:53
Jack, hydrangeas are usually very easy to grow but they need a couple of things....firstly moisture. Water! Lots of it for best growth. The name itself, HYDR...angea tells you it likes water. So, this may be your issue.
when you plant in comtainers do you use ordinary multi purpose compost? This is not really adequate. At your garden centre or DIY centre ask for JOHN INNES compost. Slightly more expensive but it's what you need.
to possibly confuse you, the colour of your hydrangea is important too. If your hydrangea is pink or red then John Innes is fine. If you have a blue hydrangea ask for John Innes ERICACEOUS compost.
dont go mad with feeding either. Good compost and moisture and a little shade if possible Jack