A good way to determine when to prune is to look at the buds.
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Pictures. A light trim is safe at almost any time of year, whether you're shaping your rose bushes or just. It's quite safe to trim them every now and then.
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In the coldest climates, prune these roses back to live growth. Create an open vase shape with the remaining canes by removing the center stems and any crossing branches. When the buds begin to swell, go ahead and prune.
Pruning roses is a task that people are often unsure how to go about.
You can also let the roses tell you — when they start to bud or leaf out, it's time. In the cold season, prune english roses by 1/3 to 2/3 of their height. Major pruning should be done in early spring, after the last frost in colder climates, by following the 8 basic pruning steps below. It also promotes strong, fresh growth that will carry flowers.