That I do not know. I think it will depend on if you grow it for flowers and fruits, or just leaves. If you are not worried about getting a bloom next year, you can prune for aesthetics any time you feel like it as long as you don't take off more than 1/3 at a time. (in this case, the dead sections count toward that 1/3, since they were 'pruned' by the frost). If you do want it to flower well you will need to look up species-specific guides.