Knockout roses are small bush roses that produce little pink, yellow or red flowers. The bushes have been designed to resist certain diseases and survive drought conditions for a period of time. The height of these roses can get upwards of 4 feet if not maintained, and the plants can spread outward the same distance. Knockouts can be found for sale at various home and garden centers, mainly during the summer months.
Cut out dead or damaged canes with the pruning shears.
Cut back the main canes by a third of their length. Cut back to just above an outward facing bud at an angle. Do this in early spring before the flowering season begins.
Pinch off dead blooms in the late spring. By removing them, you encourage the rose bush to grow new buds and bloom again. This way, the plants can flower multiple times during the summer. Knockout roses will slowly rebloom on their own, but if you are impatient, pinch off the dead blooms to make them grow more quickly.