when can I prune a melianthus major?

Hi, I have a Mellianthus Cosmosus which is the smaller version of this shrub and I pruned mine a couple of days ago. I have it in a pot at the moment and I have put it in a sheltered position. As log as the root ball has survived and stays frost free you should be fine

Thanks for info, I should have said it never lost it's it's foliage and continued to grow new leaves, despite the worst winter for 30 years! There's now quite a lot of new growth, I was concerned that pruning might kill it.
ettapat