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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”. In this case, we recommend cutting back to 6” high once every two years. 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 PETITE KNOCK. As soon as the weather cools and you get some rain, your 'Knock Out' roses will live up to their name, sending out fresh foliage and blooming for the rest of fall.

The rose really is undoubtedly the best-loved flower and most widely planted shrub in the South and all other temperate parts of the bushcutting.buzzted Reading Time: 7 mins.

Mar 01, Remove and discard any dead, crowded, crossed or rubbing branches. The goal is to open up the plant’s center and eliminate unnecessary suckers or random shoots. Cut the rose bush back by 1/3 to 1/2 the size. With severe heavy pruning, the plant can be cut down to 18″″ depending on how large the rosh bush bushcutting.buzzted Reading Time: 4 mins. Sep 17, Always prune in early spring when new shoots 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 bushcutting.buzzted Reading Time: 5 mins.

Jan 08, Knockout roses are very fast-growing, and you have to prune them timely.

Before Knock Out rapped at the garden gate, roses required at least six hours a day of sun to thrive.

A proper pruning technique is a must. February is the best month for pruning. First, remove the deadheads and any broken branches. Open up the inside of the bush by removing dead or unproductive branches.

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.

The plants typically grow no more than 3 or 4 feet tall with a similar spread, and they tend to be more resistant to diseases than most roses.

It is possible to leave them higher than that, depending on how big you want the plants to be later. It's wise to trim away the remains of a Knock Out rose's blossom to keep the plant tidy, remove seed pods and encourage luxurious waves of new flowers. 1 Soak a rag in denatured alcohol.