Yes, it is fine to plant Knock Out® Roses in containers. Spread. It had everything -- showy, continuous blooms; compact growth habit; tough-as-nails constitution; and, best of all, no need to spray for black spot disease.But now, nature has tossed green kryptonite into Superman's garden. The best time to transplant is late winter or early spring while the plant is still dormant and before new growth begins to push out. Keep this in mind when deciding on a preferred height and shape for your bushes. In most cases, the term âminiâ refers to the size of the bloom and not necessarily the size of the rose bush. Watch our planting video. It may also be turning yellow because of too much water or fertilizing. mature size: On average 3â4â h x 3â4â w. foliage: Deep, purplish green. In the spring, after the last threat of frost has passed, cut back your roses (using hedge loppers) to about 12". Don't worry—while the plant may drop some leaves, it won't be detrimental to the overall health of the plant. In early spring, trim the shrubs down to approximately one-half to one-third their current size. Donât allow the KnockOut rose bushes to dry out between waterings. Also very low maintenance. I am getting ready to plant a long border at the outer edge of my property between my neighbor and I and wanted to use ornamental grass and mix pink Knock Out Roses to go with Purple blooms on the grass. You can plant Knock Out® Roses in the spring or the fall. Do not fertilize late in the summer as this is the time the rose should be preparing themselves for dormancy and you do not want to create additional unnecessary new growth that will likely die back from the first hard frost. If you decide to plant them in containers, transplant into a container 2 sizes larger than the size pot the plant was currently in to give it room to grow. All members in The Knock Out® Family of Roses are self-cleaning, so there is no need to deadhead. A once a year cut (to about 12-18" above the ground) in early spring (after the last hard frost) is also recommended for maximum performance. Helpful 0 Not Helpful 0. I have had red Double Knock Out Roses for years and love them. The first wave of flowers will be abundant. Again, the Sunny stands out from the crowd, as its growing habit is slightly more compact and upright, while the Rainbow is also more compact than the rest of the family. Leave the containers outside through the first few frosts then bring them inside and store in a cool, dark area such as your basement or garage. Helpful 0 Not Helpful 0. This Double Red Knock Out® Rose bush will be a knock out of the park with its explosion of color all summer long! Grows well in full sun. (124) Write a Review. If you want to try the organic route, there is a product called Shake-Away Rodent Repellent which uses the scent of fox urine to discourage voles from burrowing into the soil beneath your roses. Knock Out 2 Gal. Then the roses will typically have scattered blooms until another wave of heavy flowering occurs. You may also want to wrap the plant with burlap. habit: Bushy. The soil is categorized by its ability to drain water, its pH, its grain size, and its nutrient content. The KnockOut rose bush can grow to 3 or 4 feet tall and wide, with a wide range of available flower colors. Mature Height is 2-3ft, mature spread is 3-4ft. These abundantly flowering shrubs are specified to be as wide as they are tall. We are always working with breeders and hybridizers to develop Knock Out® Family worthy introductions, in all colors, forms and habits.