<human>:  How do I prune a rose bush?
<bot>: To prune a rose bush, start by removing any damaged or dead stems. Next, cut out any stems that are more than three years old, as they will be unproductive. Cut back any crossing or rubbing stems and any stems that are growing inwards towards the center of the bush. Finally, cut the remaining stems to promote new growth - the ideal length should be around 5 to 7 inches.