You can prune Knockout roses if you need to do some shaping pruning. They will do fine without deadheading pruning. I just prune them up a bit as needed for shaping and removing dead cane material in early spring once they form leaf buds. That way I know how much is truly dead. Here is a link to an article for you too: https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/prune-knockout-roses.htm
Answered on May 10, 2015
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