The aim is to improve flowering, to maintain an attractive shape and to keep plants healthy ... there are many different types of rose, some which need pruning in the spring and others later ...
Next, take out branches that are outgrowing their allotted space or ruining the shape of the plant. Continue to improve the shape of the rose by removing about a third of the older stems.
Rose of Sharon is forgiving of pruning mistakes, but there is still a correct way to prune, based on how you wish the plant ...