All my viburnam and japonica shrubs have gone brown. Please help!!
It's most likely a sign of cold. Many evergreen viburnums round here are looking very brown, as they have after the last 3 or 4 winters here. They usually recover by June so be patient and wait for new shoots to appear before pruning back or giving up entirely.
I have to say that my own evergreen viburnums were wiped out in Jan 2009 when we had -32C followed by a couple of weeks around -25C. That took out eleagnus, choisyas and a nothofagus antartctica to as well as roses, conifers and clematis. My deciduous viburnum is still OK though.