I have a Rosemary and a thyme in quite a big pot that has not come out of winter that well. The Rosemary's roots are brown and the leaves are spotty and yellowing. There are some flowers on it. I have checked it for grubs and there isn't any of the little blighters in the pot. I assume I need to trim the roots back to there they are healthy but my worry is that if I trim back the roots it will kill the plant because the remaining roots will not be able to support the plant.
I am surprised it didn't come through winter better. It has been in a sheltered position with several other pots that survived better. There is gravel in the pot for drainage.