should i deadhead knockout roses
Knockout roses are deadheaded to keep the plant looking tidy as this rose produces blooms from mid to late spring through fall even without deadheading. Knockout roses produce flushes of blooms every five to six weeks.ips & Warnings. 1  Knockout roses are self-cleaning, meaning the petals fall off faded blooms while the plant continues to produce flowers. 2  If you don't mind several periods of your rose bush having a slightly scruffy appearance, you can skip deadheading.