Shrub roses can be pruned with electric hedge trimmers. Simply trim off about a third of the growth. Remove woody old canes using a pruning saw. Saw off the old canes as close to the bud union as possible.
Keep floribunda rose bushes tidy during the growing season by using floral snips or scissors to cut off clusters of spent flowers. Prune everblooming roses from March to early May in these areas.
For example, prune roses in Atlanta and Washington, DC, in early March. For Dallas and St. Louis, pruning time is. Nov 28, Cut back old wood about 30 to 40 percent before growth begins. Always cut to a live bud pointing away from the center of the shrub to encourage outward growth. Start deadheading after the first flush of flower, and continue throughout the summer to encourage more blooms.
Species Roses, Old Roses, and Once-Blooming Shrub Roses. Celebrating 20 Years of Knock Out!. The original Knock Out was introduced 20 years ago and forever changed the way we think about roses. With ten additional colors and flower forms to choose from, plus the flower power and easy maintenance that you know and love, it’s easy to understand why Knock Out Roses are the #1 rose brand.
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.