I'm here just outside of in Boston and I have some roses that are about a foot taller than I'd like them to be. Most articles I'm reading about pruning say that the ideal time is early spring when leaf buds just begin to show but before they open. These roses definitely already have their full complement of open leaves, so is it too late to prune? If so, I'm curious to know what it is about pruning this late that could potentially cause problems. Thanks.