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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.

Will hydrangeas rebloom if deadheaded?

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.

Answer: 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, 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. It is possible to leave them higher than that, depending on how big you want the plants to.

3. Prune the bush annually to encourage new growth.

The color will be much more intense with the cooler temperatures in the spring and fall.

Get out your hedge shears in late winter or early spring. Inspect your rose bush and decide how high you want it. In the summer, prune rose bushes to remove dead or diseased branches. Make the cuts one inch below the diseased branch, so only healthy wood remains. Summer is also the time to look for any branches in the center of the bush that are growing across each other.