Answer: You won't hurt your shrub rose if you prune it back. The best time is late winter while it is dormant, or early spring just as leaf buds begin to swell on the canes. At the very least you should wait until after the first heavy frost which will signal your rose that it's time to go into dormancy. If you prune it now while the weather is still warm any new growth will die out in the winter and you'll need to prune it again in the spring. So, just wait until spring to do your pruning. Most shrub roses can be pruned down to about knee-high in the spring. New growth will develop from below the pruning cuts and lots of new flowering stems will be produced. Enjoy your garden.
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