mine looks like this too and I intend to prune it back beyond the damaged stems. it will re-sprout so it wont look to bad in a few months.

I would just prune off the brown parts of the leaves. The more green you can leave on the plant, the faster it will repair the damage this summer.

I did wonder about that Tugbrethil. I’ve never cut off just part of leaves before, but I’ll give it a go! Thanks! Maybe SBG might consider doing the same?

I've pruned my mahonia several times taking full limbs off it so I know mine re-sprouts. Its a standard but now multi stemmed.

I've got one of these in my front garden and before I joined GOY, it was very big and taller then the wall so I just hacked it, height and width and it came back lovely. Had more flowers on it last year then had before. Good luck.

Thank you! Last time I pruned it, it didnt flower for a year, so I am a bit cautious!

Well, I cut the brown leaves away and left the green and it doesn't look too bad. Thanks everyone! :)