Pruning Knock Out Roses: One thing to keep in mind about knockout rose bushes is that they are very quick growing. A common question is “do I need to prune knockout roses?” Read here to look at what goes into pruning knockout roses.
How to Prune Knockout Roses. Knockout roses are a relatively low-fuss rose variety, but they still need regular pruning in order to maintain their beauty and health. You need to prune the plants once in the early spring and, to a lesser.