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Jul 21, Prune Knock Out Roses in late February, recommends the University of Georgia Cooperative Extension Service. The last hard frost typically has occurred by this time, making pruning safe, according to the rose's developer, The Conard-Pyle Company.

Dec 15, University of California Agriculture and Natural Resources: January Is Time to Prune Roses; Sunset: Shape-up Time for Roses. 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. Sep 17, Always prune in early spring when new shoots are beginning to form on the canes. Prune to about a third of the desired final size. Knock Out roses typically triple in size after pruning. Remove dead or damaged wood when you see it. Every two or three years, remove a third of old growth to rejuvenate the shrub. Shrub- and bush-type roses should be pruned in spring just before growth begins.

The Atlanta Botanical Garden usually schedules a rose pruning day in early March.

Roses tend to open at ground level for sufficient sunlight.

Plan to attend this if you need advice from expert rosarians. Prune bush roses in February by removing weak canes, leaving four to six main canes.