The double knock out rose is more pest- and disease-resistant than the single knock out rose variety. It also tolerates cold and drought better than other roses. This rose variety also contains twice the number of flowers as the single knock out, thus adding more color to a particular spot. Introduced by the Conard-Pyle nursery, the double knock out rose bush grows up to 4 feet tall and equally wide when it is not pruned. The bush produces blooms for 9 months, from early spring until fall, just before the frost.
Clear your planting site from weeds, plant debris, rocks and stones. Make sure it receives full sun to partial shade and has well-drained soil. Collect the debris in a wheelbarrow and dispose appropriately.
Loosen the soil a foot deep over the planting area and incorporate a shovelful or two of organic compost into it. This helps feed the young plant essential nutrients so it establishes itself.
Dig a hole over the amended planting site as deep as the container the red double knock out is in, but twice as wide to encourage the roots to spread and grow. Space multiple bushes 3 to 5 feet apart.
Remove the red double knock out rose from the nursery container and separate compacted roots with your fingers. Lower it into the hole, spreading the roots all around the root ball. Backfill the hole with soil and tamp it down with your fingers to prevent air bubbles. Water the planting site until the soil is evenly moist.
Mulch the area around the base of your plants to retain moisture and keep roots cool.