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?
Certified GKH Gardening Expert
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: