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. In the summer, prune rose bushes to remove dead or diseased branches. Make the cuts one inch below the diseased branch, so only healthy wood remains. Summer is also the time to look for any branches in the center of the bush that are growing across each other. Prune away the weaker of the branches that cross each other.
Also remove any suckers you find growing. Feb 13, WHEN TO PRUNE ROSES. The best time to prune roses is in late winter or early spring, around the time new growth begins.
This could be as early as January or as late as May, depending on your climate. If you'd like to mark your calendar, or set yourself a pruning reminder, here are regional estimates: Zones 3 and 4 - May; Zones 5, 6 and 7 - March or April.
Dec 15, One of the safest times to prune most rose bushes is during the dormant period in winter, between December and the end of February. In this case, we recommend cutting back to 6” high once every two years.
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.