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. For long-lasting, easy color, plant Knock Out roses.
Low maintenance and disease resistant, they love to bloom. The original 'Knock Out' rose has cherry red single petals. 'Pink Knock Out' has beautiful pink single petals. There are also double flower forms of both Estimated 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%.