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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. Follow these simple steps to cut back your Knock Out Roses.

Jan 08, The best time to prune all types of roses is either in late winters or in early spring. This is the time when new growth starts. Fall is not a good time for pruning, as this could lead to the death of the plant. When it comes to cutting back a knockout rose plant, there are some things you should keep in bushclear.buzzted Reading Time: 4 mins.

Mar 01, When to Prune. The beauty of Knock Out roses is that they can be pruned nearly any time without sacrificing beautiful blooms. Here in the south, we can expect the first flush of blooms around Mother’s Day in early May. This will be the largest flush of bushclear.buzzted Reading Time: 4 mins. Jan 13, 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 bushclear.buzzted Reading Time: 6 mins.

A resting phase is a good time to prune. About the only time not to prune is late summer and early fall, as this might encourage late growth that wouldn't harden off in time for winter. In the North, winter is not a good time to prune, but winter is just fine in the South. Since you would be losing flowers anyway, a light pruning wouldn't matter so much. Here we prune in January, but sometimes give the roses a second light pruning in August to keep them reasonably sized--it doesn't seem to harm them at all.

Just a thought. jess 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.