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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 cutting back knock out rose bushes 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 treedelimbing.baron: 8 Federal Road, Suite 6 West Grove, PA United States.

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Jan 08, Proper Pruning If you want a large bush, then you should only do a light trim. Remove the deadwood and branches, but don’t cut too deep. You can prune the thick sticks close to the ground. This will give a chance to new canes to sprout. More flowers Estimated Reading Time: 4 mins.