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This was a very helpful site on knockout roses, which have become my favorite for.

Yes, Mandi, you can prune without killing your rose. In fact, you can do almost anything to a ‘Knock Out' rose without killing it short of rocketing it into the bushfall.buzzted Reading Time: 7 mins. 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.

Any new growth they put out after this time may not harden off in time for winter.

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. Mar 01, Knock Out roses are some of the easiest, most rewarding roses to grow! Our yard has 12 fuscia and light pink Knock Out rose bushes.

The joy of Knock Outs is their constant blooms from spring until fall. Surprisingly, these rose bushes can Estimated 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 roses.

Oct 07, 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 still prune your roses even if new growth has already begun. Buds might start forming early if the winter was especially mild. In this case, snip the growth back to the first dormant bud%.

The degree to which you are pruning would be considered rather severe for Knock Out roses. The heights you are using apply more to hybrid tea and grandiflora roses. Research indicates that Knock Out roses respond best if not cut back lower that 24 inches for the hard pruning in early spring, and more moderately in the fall.