How To Prune Roses 

Pruning Rose Stems
Use sharp secateurs for a clean cut. The conventional method is to make the cut just above an outward facing bud, with the cut sloping downwards and away from the bud.

However, in trials where a hedge trimmer was used to prune roses to the correct height, these bushes performed just as well as those pruned in the conventional (and more time-consuming) manner.