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Avoid heavy prunings during the heat of the summer.

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. If you want to cut back your plant less frequently, you can certainly do so, as Petite Knock Out should maintain its height of about 18”.

Jan 13, 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 shrubhauling.buzzted Reading Time: 6 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 Estimated Reading Time: 4 mins.

May 18, 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. In spring I cut mine to 18″, which is 16″ below the height I want them to flower: about waist high. 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, and shape them up as needed throughout the rest of 10598 Yorktown Heights NY K. For long-lasting, easy color, plant Knock Out roses. Low maintenance and disease resistant, they love to bloom. The original 'Knock Out' rose has cherry red single petals. 'Pink Knock Out' has beautiful pink single petals. There are also double flower forms of both. Feb 13, Knock Out Roses: Just like climbing roses, pruning rules for Knock Outs are similar, but with a few exceptions.

Knock Outs are generally ready for their first pruning in their second or third season, after reaching a mature height of feet.