Fall is a good time to plant Knock Out roses provided you can get them in the ground at least a few weeks before the first hard frost occurs. Knock Out roses are a family of hardy shrub roses the come in eight varieties in a range of colors and double or single blooms that, though beautiful, are not known for a prominent rose scent. Hardy down to USDA Zone 5, fall planting allows the roses to establish roots and become well hydrated in preparation for winter conditions. The Conrad Pyle Co. bred these roses for easy care adaptability to a wide range of conditions.
Excavate a planting hole that is two times the diameter of the rose root ball and just as deep. Add generous amounts of compost and well-aged livestock manure to enrich the soil.
Slip the plant from its nursery pot and set it down into the hole. Add or remove soil from underneath the root ball as needed to bring the surface of the root mass in level line with the surrounding soil.
Back-fill the excavated and amended soil around the root ball pausing halfway up to water in well. Add the remaining soil and tamp down lightly to secure the root ball in place. Water again to drench the soil down to a depth of at least 6 inches.
Lay down a 2- to 3-inch thick blanket of organic mulch to insulate the roots and prevent weeds or moisture loss. Use shredded bark, cocoa-bean hulls or leaf-mold startings 6 inches from the main stem and extending out past the drip line of the rose.