If it's just a few straggly bits you want to trim off, then it should be fine to do it now. Anything more I would leave it.
Mine look awful right now. For the first time I can remember, since they were planted many (many!) years ago, they have been badly hit by the frosts and I am waiting to see how well/if they are going to recover. The sage that shares their south-facing wall looks even worse, but I know that will withstand a hard cut back, which it needed anyway.
I am waiting for more promising weather before doing that. The days have been lovely but the nights have been cold and everything is dry. Bring on the April showers - but nothing promised for the next week!
Thanks Buttercupdays. Ideally mine need cutting back hard so I think I'll leave them till after flowering. Like yours, mine have also been hit by the frost though the wisley yellow is okay.
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