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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 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. 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. When To Prune. ‘Knock Out' (red, pink, double, etc.) blooms on new growth.

The original 'Knock Out' rose has cherry red single petals.

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 get lots of blooms in a couple of stumpclearing.buzzted Reading Time: 7 mins. Sep 17, Always prune in early spring when new when do you trim knockout rose bushes are beginning to form on the canes. Prune to about a third of the desired final size.

Knock Out roses typically triple in size after pruning. Remove dead or damaged wood when you see it.

Every two or three years, remove a third of old growth to rejuvenate the stumpclearing.buzzted Reading Time: 5 mins. Mar 01, When to Prune. 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 stumpclearing.buzzted Reading Time: 4 mins. Sep 12, If the existing buds have swelled up but no new growth has appeared, it means the roses are ready to prune.

The main pruning period for knockout roses is in late winter or early spring, just as the plant prepares for another season of growth. You can Views: K.