Weak canes on Strike It Rich
This spring, I purchased a potted Strike It Rich rose bush at Home Depot. All the green canes are growing off of some central thick old brownish canes which had been trimmed to about 5" in length at the originating nursery. Several of the green canes are weak and a couple have broken halfway through (whether from a passing squirrel or the nasty 6 year old next store who plays ball in the yard near my garden despite co-op signs posted prohibiting same I cannot tell). One of the semi-broken canes I propped up by tying it with vinyl tie-up tape to a stake. The other was broken worse, although the leaves at the end are still hydrated.
I would like to know when and how to prune this rose when the growing season is over, so that it only has strong canes in the future.