I HAVE SEVERAL KNOCKOUT ROSES DOING VERY WELL . BUT ARE GETTING LARGE AND CROWDED. DO I CUT THEM DOWN TO THE GROUND OR SHOULD I

Question

CONTIMUE TO PRUNE OUT THE LARGEST CANES ?

Answer 1

You can cut them down by 1/3 to 1/2 each spring.

https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/prune-knockout-roses.htm