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Heavy pruning though should be done in late February in warm, southern climates.

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. 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.

Although ‘Knock Out' is marketed as a compact shrub, over time it gets pretty big. A neighbor of mine has a ‘Knock Out' hedge that's six feet tall. So periodic pruning is necessary to keep it manageable. ‘Knock Out' also tends to produce a lot of fruit, called"rose hips," that inhibit future stumpchopping.buzzted Reading Time: 7 mins.

Oct 07, 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 96%. Mar 01, 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 was. Tip: Wipe off the cutting blades of the pruner with antibacterial wipes before moving to a different rose bush.

I severly cut that 9 foot tall bush back to about 30″ stumpchopping.buzzted Reading Time: 4 mins. Sep 17, Tips for Pruning Knock Out Roses. The Knock Out group of shrub roses blooms repeatedly every five to six weeks throughout the growing season. There are varieties with both single and double flowers. 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 stumpchopping.buzzted Reading Time: 5 mins.