Mine actually got worse after the photos I posted with the last 6-10” of just about each limb looking completely dead and brown. Amazing how new growth has come through although I have ‘tidied-up’ these ends by snipping many of them off.
I'm also in the South West UK and have the same problem. I have two ceanothus, one "Concha" and the other "Autumn ?. The Concha is doing better as by a south-facing wall and more sheltered but the Autumn one looked awful. It now appears to be recovering but I may take it out later in the year. I realised yesterday that we had put a more open trellis fence on top of the wall behind it last year, which of course gave it less protection. I never gave a thought to the poor ceanothus.
I have a few Ceanathus trees in my garden and a couple of them have branches which have gone brown, the rest of the tree is thriving and producing flowers. Suspect it was frost damage over the winter. Should I prune the brown branches?
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Frost damage this year which caused many younger ceonothus to turn brown including mine probably didn't help matters.