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Thin out dead, weak, and old growth; reduce plant size according to type of rose.

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. Follow these simple steps to cut back your Knock Out Roses. Mar 01, When to Prune.

These are low-maintenance bushes and can grow on a variety of soils and in a variety of weather.

The beauty of Knock Out roses is that they can be pruned nearly any time without sacrificing beautiful blooms. Here in the south, we can expect the first flush of blooms around Mother’s Day in early May.

This will be the largest flush of treemulching.buzzted Reading Time: 4 mins.

When To Prune. ‘Knock Out' (red, pink, double, etc.) blooms on new growth. This means that you can prune it almost anytime you want without ruining the season's bloom. If you prune now, you'll remove some flower buds and delay flowering, but you'll Estimated Reading Time: 7 mins. Jan 08, Knockout roses are very fast-growing, and you have to prune them timely.

A proper pruning technique is a must. February is the best month for pruning.

Question: Is there a way to get my 'Knock Out' roses to look good after this hot summer?

First, remove the deadheads and any broken branches. Open up the inside of the bush by removing dead or unproductive treemulching.buzzted 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.

It is possible to leave them higher than that.