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There's no need to keep the flowers groomed; they're self-cleaning.

Knock Out Roses Pruning Steps: 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. May 18, 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. If you want continuous blooming, clip branches 16″ below the level where you want the next flush of flowers.

Mar 01, Yes you can plant it in a large pot but be aware it will grow fast and you will have to trim it a few times during the summer to control and maintain the size and shape. Congrats on the purchase it will look gorgeous next to a pool. 😉Estimated Reading Time: 4 mins. Yes, Mandi, you can prune without killing your rose. In fact, you can do almost anything to a ‘Knock Out' rose without killing it short of rocketing it into the sun.

For Estimated Reading Time: 7 mins. Jan 13, The degree to which you are pruning would be considered rather severe for Knock Out roses. The heights you are using apply more to hybrid tea and grandiflora roses. 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 bushfall.buzzted Reading Time: 6 mins.