Trimming Knockout Roses
I have red knockout bushes. Two are about 3 1/2 feet. I would like to have them spread out more. If I trim them back a foot, will they spread? I also have two others that are not spreading which start out yellow then turn white. How do I take care of these two?
Pruning back your knockout rosebushes will usually stimulate more growth, just doing a 6 to 8 inch pruning back should be sufficient to achieve this stimulation. Yellow blooming roses usually do have a problem with turning white fairly quickly. There are a few that hold a nice yellow color but most of those are more of a deep golden or redish yellow. So that much is pretty common. Here are some articles on Knockout rosebushes that you may find interesting: