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Get When To Prune Knockout Roses Images. After you cut back, check your rose bush for any smaller or damaged canes that may need to be removed to promote better growth and air flow in between branches. Before we get to the videos, let's answer the when question about knock out roses and pruning.
Before pruning a plant, make sure it is planted in fertile soil.
Keep this in mind when deciding on a preferred height and shape for your bushes. Remove any remaining foliage when to prune roses timing is determined by the class of the rose plant and the zone in which it is growing. Cut to remove straggly or damaged leaves and stems. Knock out roses do best in full sun or partial shade.