PlantLife Online

Answer

Yes, to keep roses healthy and producing flowers rose bushes should be pruned. The how and why: (1) The first pruning cuts should be to remove all the dead or damaged canes, dead and damaged canes will attract insects and disease. (2) Your next cuts should be to remove any suckers growing below or away from the main stem.* (3) The next pruning cuts should be to remove any large old canes and very thin elongated canes about the size of a pencil, both are less vigorous and will produce fewer flowers. (3) Next its time to remove any canes that are rubbing on another adjacent cane. When two living canes rub together they can create open wounds which opens the plant disease and insects. (5) The final cuts should be made to control size and shape, the overall height will depend on the type of rose you are growing. The when: In cold climates roses should be pruned in early spring when the buds just begin to turn pink and plump up. In frost free climate zones its best to prune roses in the fall. Remember roses bloom on new wood so pruning too late in the spring may reduce the number of blooms. During the growing season roses can be "Dead-headed" which is the removal of faded flowers before they can develop rose hips. 

* Suckers are shoots that grow from the rootstock rather than from the named variety of rose which you purchased.