The best time to prune most roses is in late winter or very early spring, before the plants break dormancy (when the buds begin to swell), or when the plants are just starting to send out new growth in the form of tiny, red buds.
This is around the time when forsythia bushes bloom. Most standard climbing roses are the exception to this treeleaning.buzzg: Delta CO. Remove an old garden rose bush's old, unproductive stems, and reduce the bush's overall height by one-third. Make each pruning cut 1/4 inch above the next bud on a stem.
The bright-red rose hips may be left on the plants for fall color. Pruning cuts are made at a Missing: Delta CO. Apr 27, The best time for the first pruning of roses is generally somewhere between late April and Mother’s Day -- after the plant has broken dormancy and after the final spring treeleaning.buzzted Reading Time: 5 mins.