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The white spots are either fungal or mites.

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. Mar 01, Depending on where you live, you can technically cut your knock outs back anytime, but I recommend doing a drastic prune in late winter/early spring.

Have you pruned them lately? For the health of the plant you should prune it back by 1/3 to 1/shrubfell.buzzted Reading Time: 4 mins. Jan 13, 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 shrubfell.buzzted Reading Time: 6 mins.

‘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 get lots of Estimated Reading Time: 7 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.

First, large clusters of lightly fragrant, cherry red flowers bloom from spring until the first hard frost of fall.

Sep 12, 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 shrubfell.buzz: K. Jan 08, You can prune once a year and then trim and cut when you feel the need Proper Pruning Knockout roses are such hardy plants that any way you prune, they survive and thrive!