Overall size reduction is done in Feb., as new shoots are developing. You can cut them straight across with a hedge shear, this actually results in more flowering than the old selective pruning (see web site of Royal National Rose Society). Flowering shoots are shortened throughout the blooming season, after petals drop.
Palm Nut, roses should be pruned twice a year except for Climbers. In the fall cut all the rose canes 18" from the ground aprox knee high to prevent winter damage. in the spring find an outer bud usually 3 or 4 buds from the ground, which ever is pointing outwards. During the season do the normal pruning when the rose finishes it bloom. George
