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The degree to which you are pruning would be considered rather severe for Knock Out.

To maintain a size of 3–4’ w x 3–4’ h, Knock Out Roses should be cut back once a year to 12” high. Check your rose bush from time to time in late winter/early spring, and when you start to see new shoots growing from the canes on your rose bush, that’s a good sign that it’s time to prune.

‘Knock Out' (red, pink, double, etc.) blooms on new growth. This means that you can prune it almost anytime you want without ruining the season's bloom. If you prune now, you'll remove some flower buds and delay flowering, but you'll get lots of blooms in a couple of stumpcutting.buzzted Reading Time: 7 mins.

Jan 08, Some people prefer to do two pruning every year - first time in January when you should cut back by about half their height. The second time you should cut back at the end of August but not very severely.

This time cut them back by only about one-third of the stumpcutting.buzzted Reading Time: 4 mins. May 18, I visit mine every week and twist off the faded flower buds. Every four weeks I cut long stems back. This two-step process keeps new growth coming and removes the hormone-filled hips that tell the rose to bloom more slowly. Remember that your Knock Out will make flowers 16 inches above where you make your summer cuts.

Research indicates that Knock Out roses respond best if not cut back lower that 24 inches for the hard pruning in early spring, and more moderately in the fall. I’m surprised they have done well cut back as short as 12 inches from the ground. Sep 12, Knockout roses are a relatively low-fuss variety that can make a welcome addition to any yard or garden, but they do require a little seasonal pruning in order to grow healthy and beautiful. Cut back your roses extensively at the beginning of spring, Views: K.