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Once Blooming Modern Shrub and Old Garden Roses: Prune in mid-summer after flowering (usually mid- to late-June). Prune these shrubs lightly to shape them. They generally do not need a severe pruning, but benefit from being thinned out. Fall Pruning. Some people like to prune their roses in the fall. Feb 27, Everyone seems confused as to when they should prune their roses. Interestingly enough, most seem to feel it should revolve around man-made calendar dates like October or January.

Some advocate pruning later, some sooner, and some say just do it when you have bushhaul.barted Reading Time: 6 mins. Neglected, overgrown spring-flowering shrubs often require extensive pruning to rejuvenate or renew the plants.

The best time to rejuvenate large, overgrown shrubs is late winter or early spring (March or early April). Heavy pruning in late winter or early spring will reduce or eliminate the flower display for 2.