By Moski
United Kingdom 
when do you prune hydrangers
26 Feb, 2012
Answers
If you prune them hard you will cut off this years flowers. Best just to cut off the dead flower heads to a good pair of buds and take out any dead or spindly growth from the middle of the bush if its a big one.
27 Feb, 2012
April, assuming they're the mophead variety.
26 Feb, 2012