Q.Our Knockout Roses Are Out Of Control. Large At The Base Almost Like Regular Old Rose Bushes.
How far can I cut them back without damaging or killing the whole bush?

BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on September 16, 2022
This will be in Spring, and you can cut the plant back by about 1/3. Whether this be across the top, or just removing 1/3 of the plant's branches. Here is an article for more information:
https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/prune-knockout-roses.htm
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