We have a hydrangea that has survived the builders tramping on it and dumping rubbish all around it and though I was never fond of hydrangeas, I admire this one, as it has become a lovely plant despite the odds. Unfortunately, I didn't prune it this year and it is now suffering the recent frost and snow, and the leaves are blackening - not a pretty sight, especially as it's in the front garden next to folks walking by.
My pruning book mentions late winter pruning and demonstrates how to do this but I would like to know whether I should do it whilst it's still very cold or just do a light prune to remove the flower heads? Also, do I need to cover it with fleece or bubble wrap after I've pruned it? I usually dry the flower heads but still have loads from last year so didn't get round to it this year which of course I now regret! Thank you.